I don't think he should give up. However, if someone posts something for 8 months and doesn't get any results, it would be just stupid to continue, unless it's for revenge.
Revenge for blocking seems to me the most probable here, because if it was about clarifying the case, he would have found another way of communication a long time ago.
He is probably from a 3rd world country where that amount is a big deal. He seems desperate which is why he is trying everything to try and reclaim his funds which sadly won't help since 1xbit rarely returns gambler funds.
He is clearly not doing any of this for the sake of revenge. Also, this forum is the second best way after their site to communicate with them.