Is it? It was established in 2018, not so new.
It is a very bad behaviour and since they are paying newbies/Jr members for this, they wouldn't mind if they are tagged or if their posts are removed, they'd just continue doing what they are paid to do.
I see the name of the exchange only from last year so I assumed that they are new and also they ran an actual signature campaign on the forum last year for just two weeks then they came back to their shilling campaign.
Likely they won't care about deleting the posts or even banning them cause they will just pop out with new accounts again and do this again and again so the possible solution for stopping them is to put a word filter on Bitget for low-ranked members as hugeblack suggested.