Yeah, that's a really good point, DMing a stranger is a much more intimate interaction than leaving a comment on an AO3 work, where that well within the parameters of what you expect by posting there.

Re: your folder of nice things, that's a great idea! I also think that archiving non-AO3 fandom stuff is a really good thing to do, even if it's just to look at when you're a bit down, or to relive the glorious highs of people telling you that you are good at Thing, because so much gets lost over time and digital erosion is incredibly real and exacerbates this effect.