[dsagal]

It makes sense for a successful product that’s being hurt by competitors packaging it up and selling as a paid service. My advice: for a younger product, keep it actually open-source (FOSS).

With either Sentry’s FSL license or FOSS, you as a user can run your own. If you want a paid managed service, you can pay Sentry. With FOSS, there can be competitors who offer such service using the same exact up-to-date version, and undercut Sentry on price (since they aren't paying developers). With FSL, they’d have to run a 2-year old version. That’s a disincentive to competitors.

BUT: even with FOSS, a similar disincentive exists, because the maker of the FOSS software could decide to change license, forcing competitors to run a stale version or invest into their own development, or pay up for licensing.

Seems if you are small enough, pure FOSS is better for this reason (the option to release future changes under a different license is always there). But if you are big enough to have competitors, and you can’t convince enough competitors to pay or revenue share (e.g. through support agreements), then FSL can be a way to twist their arms without hurting most other users too much. (It does hurt to some extent, as the many arguments in this discussion point out.)