The incentive is that running the infrastructure required to host Sentry is challenging and requires engineering resources. You can choose to use our hosted services for a fraction of the cost (engineers are expensive).

Aside, there seems to be confusion about what “relicensing” means. Even in this hypothetical scenario you’ve outlined, we can’t “relicense” already released software. Many users hosting Sentry internally are using years-old versions happily; they would continue to be able to do so. They could also choose to fork the last permissible version and maintain it themselves.

Personally, I think this scenario (relicensing such that self-hosted users could no longer do so) is incredibly unlikely. I don’t believe it would really do anything to grow the company.