Incidentally, Google is kinda doing this with email.
If you run your own email server for your business, they will rate limit you under the guise of spam protection, even if your emails are never caught in their spam filters. Some business reported up to 12 hour delays on their emails being delievered. They want everyone to use preferably their own service, or at least another major giant’s, so they can push the smaller players out of the market.