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…
I understand the idea behind banning sexually explicit writing, but that basically means that large large percentage of literature cannot use Google services. Anyone writing a novel basically shouldn’t use docs in case they might someday want to include sex in their writing.
> Do not distribute content that contains sexually explicit material, such as nudity, graphic sex acts, and pornographic material. This includes driving traffic to commercial pornography sites. We allow nudity for educational, documentary, scientific, or artistic purposes.
This squares with what happened to the authors here, who were only subject to enforcement actions when they shared the content via Google Docs.
But yes I think the basic idea of being unable to "trust" a free service which has no contractual obligations to you as a user is a given under any circumstances.