Devs have a responsibility for what they publish, free or paid. If it's buggy, it is unprofessional and even thoughtless to just drop it out there and walk away. Those who do that, they harm their own reputations.
I will never and have never supported themes or plugins from authors who charge for their support. I have happily said in forums that they have never offered support in our forums. Those authors should pass or fail on their own. Why should I give my time for free when they value their time higher?
It has also always been the case that authors release themes and plugins and clearly state they will not provide support. We cannot insist they do.
What is Support?
Posting here to every request?
Adding all features demanded?
Posting here 5 times a week? 20 times a week?
And it does no credit or help for WordPress to facilitate and even promote the distribution of plugins that are not supported.
We cannot know that until plugins are released and being used by many people. So we cannot then remove a plugin. That will cause authors to stop supporting or even creating plugins. It will cause arguments.
I posted my opinion in belief that it is possible WP does not realize what is going on
I know support is not always given. This has been the case since plugins and themes happened from 2004 onwards (and I've been in WP since then). But there is not anything we can do. The ability to contribute has to be matched by the ability to withdraw.
And I want to emphasis this:
"Devs have a responsibility for what they publish, free "
Some authors provide a huge amount of support. They visit here, they provide support on forums on their site, they release new features and they get nothing back. They get very little in the way of contributions or gifts from wishlists. If you were to divide what they get by hours spent on plugins (which they do in their free time) it would be pennies. Would everyone here do that? No. So let's not lose sight of the massive contribution most authors make and also accept that the ones you mean are the tiny minority.