Having access to the source doesn't automatically mean the owner/maintainer owes you nothing. I think the comment is promoting only the "FOSS == gratis" side of getting things for free ($0) and not considering the original "FOSS == insight and rights, even if paid for" side of things.
> "there can be explicit contract where you are funding specific feature"
Yes, I said as much when I said you can have a contract for support and also have FOSS software. Here, you are downvoting me and agreeing with me. There can be a explicit contract where you have the source source and also are entitled to some development that you're paying for.
> "You can stop using the software if it does not provide you any use. That is the only thing you are entitled to."
NO, here you are changing your mind again and narrowing it back down to "it was free so you have no rights". You cannot make the judgement that because someone has open source software, they didn't pay for it, and you cannot make the judgement that if they have open source software, they are not entitled to anything. The three are DIFFERENT things. The original point of FOSS was to avoid vendor lockin, not to get free downloads from Github.
In case it isn't extremely clear, downloading a free and foss tool from Github does not entitle you to feature requests or support. Donating to it does not either. Saying "every FOSS user has no entitlement to support or feature requests because the code is FOSS" is incorrect, and a bad idea for the programming/tech industry to be spreading, partly because a lot of developers would benefit from spreading the idea of paid FOSS because they want to work on it and get paid, and partly because users would benefit from the increase in paying for software and also getting the source as part of that, including whatever entitlement to support paying would have got them normally.
There might be such people, but I doubt such projects would be very successful or notorious. Being able to put something on CV does not provide that long lasting gratification needed to develop/maintain software in the long run. If it's about your CV only, then there are probably more effective ways to achieve better returns.
(In my case I don't put my F/OSS on my CV and I don't think I'm "extreme minority")
Maybe I just see an unusual slice of the OSS maintainer world, but it’s very common.