When a project is up, open source developers are keen to promote it, put it on their CV, give conference talks. There is no obligation for companies to sponsor anything, this is not the reason behind open source.
Yes open source has changed, from when the early 90s. There are more users, companies use projects and make millions with other peoples work.
I feel with the maintainer, with how ungrateful people are. And demanding without giving.
Open Source licenses fall short.
Open Source projects should clearly state what they think about fixing security, taking on external contributions or if they consider the project feature complete. Just like standard licenses, we should have a standard, parseable maintenance "contract".
"I fix whatever you pay for, I fix nothing, I fix how I see fit. Including disclosure, etc."
So everyone is clear about what to expect.