Outside of Musk companies? All the time? Google workspace doesn't train on your email. Gmail does. Any b2b targeted services absolutely protects customer IP. It's one of the most basic requirements.
All of the major companies have been caught training on illegally acquired data. The law doesn't matter to any of them. It makes sense that Google would care about their own paying customers, but that's for commercial reasons, not for any particular concern for the law.