Totally fair. The Matter Camera libraries will be released sometime this fall, and then I would guess they will have to decide how to move forward, and their roadmap is usually planned 6-12 months in advance, so there’s a good chance nothing would be open toward these changes for another year. Holding your breath for 1+years would not be good for your health. 
How so? I’m not aware of any lying.
As for dragging their feet, they’ve mostly been transparent that they weren’t likely to do it. I think that’s a little different. At least they let people know.
Additionally, it should be mentioned that regardless of Matter, they are currently working to add RTSP support to most of their cameras.
That will make it possible to get all the cameras into HomeKit too, even if they don’t add direct Homekit or Matter support. I’m really looking forward to testing RTSP when it releases to Beta.
You’d be surprised. There are a lot of companies that have backed out of matter because it’s not true open source. Companies are required to pay an annual membership fee, plus a product certification fee per device, plus the per product certificationa nd testing fees, plus annual product listing fees, product attestation authority (PAA)/ Digital certification and maintenance fee, recertification fees, and variable other alliance fees. It’s a higher barrier to entry than you would think. Keep in mind that all these annual fees need to continue to be paid forever. So for every product that doesn’t have a subscription, you immediately have an ongoing liability losing you money every year even if you no longer produce or sell the product. You will lose money on it indefinitely. Things can get tricky, particularly for companies that like to innovate with new models and upgrades. Matter in its current form rewards stifling innovation and progress away from newer upgraded hardware options, etc. There are also some potential complications with adopting Matter. In some instances, Matter is purposely “Basic” with lack of feature parity. it won’t support all of the unique, advanced features some manufacturers want to offer and be known for. It has also been a nightmare with multi-admin inconsistencies. There are a lot of technical and logistical hurdles for companies to overcome involving complexity and development time with little pay off, especially recently as there has been a pretty poor consumer experience so far.
I like and support matter, and have several matter devices, but it’s not something I would recommend to the majority of my family and friends. It does not work the way people think, and is not always straightforward. They’ve been making good strides lately, but there are lots of companies that have been intentionally avoiding it, or purposely limiting which devices they’ll allow to support it because of ongoing sunk cost liability that will haunt them forever in the future since it’s not actually true open source. There are a lot of legit concerns.
Regardless, here are their most recent responses to questions about Matter:
My hope is that they will finally review the Matter Camera libraries once they launch (they’ve long been waiting for this, and it should finally happen this fall!), then make a plan for how to move forward and what else to do after that, including a legacy bridge that will allow access to many of their other existing products. That’s the feel I get from employees when I talk to them about it.
I would not be surprised if they don’t add ALL past products though. They’d just be losing a ton of money for no reason to add support for devices they no longer produce or sell and don’t have subscriptions for. They already operate on extremely low profit margins, and adding back support for discontinued devices would be financially irresponsible in a lot of ways. I expect to see Matter for some of the most popular devices that are currently in production, and many devices that can potentially have a subscription (cameras) and won’t be an ongoing liability/loss. Though I could see them add a bunch of legacy devices under a single legacy bridge matter license. That would offset the sunk cost liability tremendously. Then they wouldn’t have to pay for every device individually. They could add a lot of past devices to matter that way. I would hope for and support that. I will definitely be pushing them to sell a legacy bridge to add lots of their past products to be matter accessible.