I remember Yahoo opened a topic about managing Yobit campaign and asking suggestion from the forum users. My advice to do same thing.

there are many accusations against them. some have been solved, some just ignored. To be honest, some of the allegations were not realistic and without enough proof.
but there is definitely a problem with withdrawing some of the altcoins. (It's not about Yobit ) Fake volume might not be such an obvious problem if they not to report a larger volume than Binance. Fake office in the UK also does not help.
I understand they want to improve his trust here, but I think the signature campaign can't help if they ignore user complaints.
Best luck whatever you decide.