big tech is evily smart: since everything is open source, they are still doing vendor lock-in via grotesque and absurd complexity and size, breaking little things here and there, or using unspecified part which is "implementation defined" etc. Not seeing that is borderline blindless than a lack of perspective.

Open source is far from being enough anymore, we (the humanity) need lean open source (including that bloody SDK, which excludes de-facto ultra-complex computer language like c++/rust/java/etc).