What do you think about the so called 2....g5 blunder?

In my opinion 2...g5 (a small trap) is better than winning the exchange. Is it something wrong with that? Thank you!

not bad this is chess 960 and not standard

Obviously, 960

It's blitz, so there's less thought, but...With a single glance, what does it trap?

Qxf5, eating more material greedily, may not be recommended but neither does it allow for cascade of tempo in kicking the queen around.

Yes, lement, you are right, I was thinking the same

The position after 3.Nb3 are better for white then after Bxa2

I could understand if you just wanted to show us the beautiful finish. But debating why you shouldn't seal the deal on move 2 does not really make sense. Imho g5 is correctly marked as your only blunder and even the f-pawn seems grabable after 3.Qxg5 Ne6 4.Qxf5 Nxd4 5.Qa5 - no alternative to just winning the exchange.