I think the ghosting/no replies problem takes more than just waiting a while for a reply to determine. If the user has been offline in that time, it is entirely possible that life struck them upside the head unexpectedly, up to real world injury and death. While that's an extreme and not the case most of the time, seeing if they've been on at all is the first step. If they have, it's time to poke and get them to say exactly what is going on. I find people often do reply after a poke as they might have missed a post or forgotten and may even be expecting you to reply because they thought they hit the reply button. They might also admit their lack of inspiration, at which point you can have a direct chat to see if it's worth continuing.

If they admit they're not into it anymore, they get a half point. They should have been more upfront in the first place, but I can get it and the fact they replied to a direct OOC comment means to me they aren't intentionally screwing with you.

And of course you have the big no-no, the one I would actually start to agree with on the 'no honor' thing. They get in, they never reply, then they bump their 'looking for people' thread or visibly go for other things. At that point they've either straight up forgotten and all you need to do is poke them, or they have a legitimate issue.

I have multiple peeves that include ghosting, so I'll just mention one - the need to write another player's character's reaction. It's not too frequent on the guild I find, but on other platforms it has been a serious recurring problem that irritates the living hell out of me and seems to do it so badly I end up just not wanting to reply to anything for a while. It's an extreme reaction and the biggest reliable killer, so I suppose it would be my largest peeve. I can elaborate or justify why I think it's straight up bad roleplaying, but I freely admit my reaction is not very rational.