I remember seeing the neutral feedback on his account and was generally suspecting of him for quite a while. Judging by what I saw, it's very likely that there was no participation in any so-called fundraiser, and it was a mere attempt to gain merit, therefore a higher rank, resulting in higher earnings from signature campaign spamming. I've been watching him for quite a while.
That fundraiser thread by borovichok was one of the lowest of the low barrel scraping things anybody could do just to get merits. He is a compulsive liar. I stopped following him after I reluctantly conceded the consensus seemed to sided to not negatively tag members for spamming or using suspected AI.
Thankfully you created this thread and it brought a new attention to the tactics employed by borovichok.
The most important thing now is that the borovichok account now has been rendered useless. If if he was to return here using that account, it would not bring him any benefit in joining campaigns therefore he will focus his attention on his other accounts.
I'm also a believer of the idea that he has other accounts as well, or that multiple people use multiple accounts at the same time. There was an irregularity in his posts, differences in grammar, punctuation and generally way of writing. The negative feedback and the attention this thread resulted him in quitting and teleporting to the rival forum, even though he hasn't posted anything there yet. I honestly didn't believe he'd actually quit, with that being said, I don't doubt he's still on the forum, just with another account, and possibly participating in a campaign.
If I had to guess, I would state with a strong belief that he is enrolled on other campaigns and he has several accounts here. Over time, hopefully those accounts will be connected to him.