MPREP account is fine. Your thread got locked because you broke the rules.
What did you not understand from his post on your thread?
ATTENTION: Due to the bounty incentivising posting on the ANN thread (which is an on-forum altcoin giveaway in any and all definitions), this thread is locked. There is zero tolerance for those blatantly breaking the "no on-forum altcoin giveaways" rule.
But we do not violate any rules! Then I saw ~100 threads banned, and it looks like today rules were changed or mprep account is hacked.
No rules were changed. Make sure to read all of them before making those claims.
From 2014:
https://bitcointalk.org/index.php?topic=434310.0-snip-
Specifically, you are not allowed to give people any incentive to post insubstantial posts in your threads. You can't offer to pay people who post their addresses, usernames, etc. You can do giveaways off-site and link to the giveaway page in a thread, but you can't give people any bonus for replying to your thread.
-snip