I’m not saying anyone should be obligated to do free work. This issue is that most people don’t feel comfortable publishing a public fork without the blessing of the creator, or at least knowing the creator no longer intends to work on the project in the near future. So you end up with these situations where there are thousands of people running production systems with unmerged security patches because the creator can’t be bothered to spend 30 seconds to write a one sentence reply to an email.
Short of being in a coma, I consider that toxic behavior.
And just to be clear I’m taking about situations where there are lots of open PRs but no signs of life for months or years on end, not situations where the creator just went on vacation for a few weeks.
But I get where you're coming from. It's even worse on Steam, where developers will actually collect money during the "early access" phase and then walk away once a (closed-source) tech demo is half-complete.