It isn’t the same principle though. Slack and GitHub can sell data to make a profit etc but the problem with open source is people can just host it themselves meaning the creators don’t even have that option.

Plenty of organisations prefer to have managed options and thus pay for SaaS, even from open source vendors, rather than hosting their own.

Also you’re getting too caught up in specifics and missing the broader point. You want open source examples? How about Nexus, Redhat, nginx, prettier much all of Hashicorps offerings, basically half of why AWS resell.

The real issue with commercial open source isn’t restricting access to customers, it’s restricting access to resellers. As demonstrated with the examples above.