AFAIK Amazon as a company is not really open sourcing a lot of their software. I was surprised that they would open source such a key component of their Lambda offering.

As someone here already mentioned, it certainly helped Fly.io steeling some of their customers. (Although Fly has no serverless offering, but uses it for a docker-ish deployment model.) And last time I checked there were a few more startups using it.

Can anyone (maybe Amazon folks here) shed a light on the rationale behind it, why they’d open sourced it and what they could possibly gain by it?