Sentry raised $90 million in a series E round in May 2022, and their total funding is sitting at $217 million.
No cloud provider even offers a hosted version of Sentry, so it's not like that's an issue for their business. Spinning up a VM and deploying your own version is incredibly straightforward. Which is exactly why they now need to switch licenses and put newer features behind more restrictive terms so users are forced to pay.
Sentry switched to BUSL in 2019, almost 5 years ago.[1]
Most of the aforementioned fundraising occurred after the license change (e.g. the $90MM round you mention from 2022, and another $60MM round in 2021).
The "restrictive terms" - which again, were introduced in 2019 - are that you can use the software but not use the code to compete against the software's authors. For 99.99% of users, this has been a non-issue, because most people have no interest in doing so.
https://openpath.chadwhitacre.com/2024/widespread-use-of-a-f...
Fair Source is working quite well for us. You should try it. :^)