The right time to look elsewhere was when Microsoft bought it.

The next best time was when viable alternatives like GitLab and later, Codeberg appeared.

The next best time was when it became clear that they were stealing your code to feed into their sparkly autocomplete and were going to sell it back to you.

The next best time was when they dumped a bunch of vibecoded garbage into the codebase and killed the uptime.

The next best time is now.

You don't even have to migrate all your stuff. Just start all your new projects on Codeberg, or GitLab, or something self-hosted. Once you get used to the new place, you can migrate your old stuff when you're ready.