Cams shared cannot be “reshared” by those with whom they were originally shared. Only the original account on which the cams were installed can share cams.
Is there some instance wherein you have experienced something different?
Placing other restrictions on shared cams has been asked for in the past. If you would like to request that Wyze add this feature, follow the link, vote for it at the top, like some posts, and add your reply post to support the request.