C4S changed in the last few years and not for good. It was always expensive but this is a feature. The best value you could get from it was c4slive which they discontinued. They said they would bring it back, they did not. So I don't think they host membership sites any longer. Cybill Troy moved to JFF I think the rest gave up.

Another change they made was about 2257. A professional like you I am sure crossed all the Ts and dotted all the Is. At least two content creators I know had to close their studios. I would say when you worked for years with a business partner existing stuff should be grandfathered.

Interestingly enough while the stores are closed its contents are still available from searches and you pay just the same. I hope they still share with the owners.