I Hate You T-shirt is listed on subetalodge as a 2008 donation present item, yet here is as a free gift. Erhm...what?

I guess this is as good a place to post as any. I don't understand your confusion. Items do get their rarity changed. sometimes Subetalodge staff misses this. Sometimes Subetalodge is correct, and someone here at Subeta has done something odd.

I know I have a copy of it, but I wouldn't have bought a donation present to have one.

When I looked at Subetalodge just now, it said "Only available in the Free Shop giveaway of July 2008" (emphasis added).

I don't think that's the same as a donation present item. The Free Shop is the thing that they open up on occasion and you can pick a random gift every five minutes and get something. It sounds like this was a special occasion where the Free Shop gave out exclusive items as well, including this t-shirt. That would make it a free item.

Yep, makes sense, thanks :)

If you look at July 2008 DP, you find it there, hence my confusion Oops, not there anymore, they corrected it I guess, good. Hence no more confusion :D