Pretty interesting spot. I spent a lot of time looking at this on Equilab. Not gonna write down everything that I went through would be way too much.

Shorter answer to your question. I think exploitative, you can probably fold this. I looked at this a long time and it feels so much like this is a slow played boat or JsTs Not sure why, just feels that way. I think because the flop had no FDs and smashes his 3bet range, I could see some players checking some of there big hands, like AA and KK and AK. I feel like they would bet 55, if 3b, and A5. Just not sure they would check the other ones twice, which is what makes it so interesting.

From a GTOish perspective, I actually think this is one of the stronger hands that you get to the river with, as it was played, and for that reason you may have to sigh call. Seeing as it is a 3bp, you don't have that many boats that get to the river this way. I think KQ is it. You would probably 4b AA, KK, QQ, AK pre and would probably bet the flop with 55. Due to the fact, that all the high card spades come out, you actually don't have that many flushes that end up here like this and your top 4 are J9, T9, T8, and 98. Assuming you call 3bets pre with all of them BUvSB

I don't know. You do have 1 combo of JsTs, the nuts, and 6 combos of KQ, so maybe you don't need to be bet/calling that many flushes, not really sure how much you would have to defend, so maybe it is still a fold.

Guess it really boils down to what type of player this was against and if you had any reads at all. I know no HUD info since anon, but maybe you had some table reads.

Pretty gross spot!!

So I did a bit more math and I think if you are betting flushes+ on the river than you can probably bet/fold this. You may have to defend 1 or 2 combos of flushes, which would be up to you. I think the more Kx you start to bet on the river for "thin" value, then the more combos of flushes you would have to defend. I don't think I would be betting Kx on the river, the way this ran out. I am kind of passive on the river in spots like this when everything gets there. I still think you can fold this though. Just don't think players on MPN at these stakes are bluff jamming the river here that often, especially on this run out. so you would have to hope he was on the fishier side and was over valuing something that you beat, like a non spade JT or trips

Thx @fawltyfelix for answer, i would bet KJ for value, other Kx checking back. it was hard to me because i would sometimes bluff this spot, but i figure out that only hand he can bluff in this spot is AQ.