Except that https://github.com/faiscadev/fakecloud has been a thing for a long time and it's AGPLv3.
replyLocalstack is almost entirely free. I’ve used it at our company for years without paying.
replyLocalstack is no longer free and if you’re using it commercially you need to pay for a license. The free plan explicitly states that it is non commercial.
replyhttps://blog.localstack.cloud/2026-upcoming-pricing-changes/