Misleading title, none of the authors involved are claiming they're locked out of the accounts. The exact quote from the OP's mastadon is "An author lost access to her explicit writing when she shared it with alpha and beta readers."

Google says you may not use its services to distribute sexually explicit content. This is a very common and reasonable policy. The authors violated that rule, and while none of them are being straightforward about exactly what happened what seems to be the case is the violating content has been removed/locked.