UPDATE APRIL 6, 2019:I was able to reclaim my account successfully today! Thank you!
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Mapuche, I am in the same situation. I just messaged Cyrus a signed bitcoin message from an address used in my account as described by Theymos in
https://bitcointalk.org/index.php?topic=497545.0 and if in two weeks he doesn't respond I will message Theymos with a signed bitcoin message to reset my account.
Currently my account is being used by someone abusing bounty programs, and English is not their first language. I'm still in possession of the original email address I registered my account with, and private keys of bitcoin addresses I posted with so I can sign messages. Weirdly the person who hacked my account didn't delete or modify my posts... they are all still there. It's frustrating as it is funny... you can tell they started using my account when it started suddenly linking Russian Twitter and Facebook accounts for reward programs, and speaking Russian. In my case they are also spamming youtube with my bitcointalk profile they hacked, and then they went and made a freaking telegram account with my bitcointalk username likely to scam people. It makes me literally mad. I don't want to post the link in case they will be notified and delete/modify my old forum posts. I wish I could do something, but I am powerless. I know how you feel.
I will update you if Cyrus in 2 weeks or Theymos responds. I am optimistic that they will help us all out if you can sign messages, but they probably are taking on many (too many?) responsibilities at the time. Really this just makes me think poorly of bounty and airdrop programs that are magnets for unsavory people looking to exploit them. It is unreasonable to expect Cyrus/Theymos to dedicate all of their time to resetting peoples accounts, and it seems like something that could be automated to some degree. Imagine what their message inbox looks like... how many messages do you think Cyrus/Theymos receive a day? Thousands? Tens of thousands? There is no way to read all of them and do other productive things. Many productive people avoid email and communication like this because to be frank it is a huge waste of time for little reward. I feel as pissed as you that someone hacked my account, but at the same time expecting Cyrus/Theymos (who are providing their own time for account recovery) to put my account recovery as a priority over other things is unreasonable. There should be an automated system implemented as Theymos suggested he was working on, or there should be a separate moderator who deals with these issues, but there isn't. As painful as it is to watch someone take your personal username and account and abuse it, we have to wait. I have faith that Cyrus/Theymos will help us in the end.