Does OSS owe us something?

This is a question mostly about OSS and ethic, but I started to think about it after I had read this answer, which belongs to a maintainer of LLVM:

https://github.com/llvm/llvm-project/issues/52696#issuecomment-994137960

To be honest, I was also annoyed with lack of range functionality when I was porting my open-source project to clang. I spent about 3 hours fixing other errors in a raw then I figured out that the last one cannot be fixed, and I must either remove all ranges or refuse the idea using clang. I preferred the second one.
When I googled the problem, I didn't find the information about range support in clang, but I found this comment. It hurt me. It sounds like: "Shut up and eat what is given". I understand, it is for free. However, you sell it to people which spend time learning your software and get dependent on it if the first impression was positive.

My conclusion is, if you promise something, you owe it. If something is not working, that is completely understandable, but you should say sorry instead of "drop your tone".