You don't get to decide that.
> It's a reckless disregard of other people's time and nerves. Build labyrinths and scatter them around the internet. Leave manholes uncovered.
That's a *you* problem, because you have wrong expectations.
> Then close bug tracker and post "Abandoned" on the front page.
You don't get to decide that.
> Then say so and then reject them. That's what PR review means. I don't have a problem with rejected PRs. I have a problem with ignored PRs.
Another case of you having wrong expectations. Like in networking, you should put a timeout on all requests. For all practical purposes a request that times out is to be treated the same as a rejection.