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Likely only a handful of people care, but Sentry hasn't been open source in quite a while https://github.com/getsentry/sentry/blob/24.12.1/LICENSE.md (I'd have to do tag-spelunking to find the last Apache 2 version)

Glitchtip is the Sentry compatible open source (MIT) one https://gitlab.com/glitchtip/glitchtip-backend/-/blob/v4.2.2... with the extra advantage that it doesn't require like 12 containers to deploy (e.g. https://github.com/getsentry/self-hosted/blob/24.12.1/docker... )

Sentry is not horizontally scalable, thus ~ not-scalable at all, if your company is big.

That's a fair point, but scaling it vertically can take you very far in my experience.

Quota/pricing.