Mandatory with an open license might shoot yourself in the foot when people fork your code. For me, the harshest you can go is to have telemetry and not prompt

Mandatory with an open license might shoot yourself in the foot when people fork your code. For me, the harshest you can go is to have telemetry and not prompt for the setting on start with the user opted in by default. Ideally, you ask on first load, and that's what I'd probably aim for. You can't ever try to force people to do anything in open source. They'll run right by you and make it do what they want it to do with or without you. I'd even imagine paying customers are broadly more happy with telemetry than open source ones. And their needs more important anyways.