the moment Google launched Gmail with free 1GB inbox many years ago the groupware suite market effectively died, the only other real player is Microsoft.

and likely Google/MSFT will deploy a copy here ran without direct interference from the US, and it'll probably chug along until the first really big lawful intercept disagreement (but there are a bunch of "mutual legal assistance treaties" so it'll take a while, and by then AI will eat us for paperclip NFTs anyway)