what's the point having 2500+ bullet


Yes, they are legit 2500+ chess players...for online and for that time control. It is just that bullet chess has different strategies and nuances regarding the less amount of time - these players are simply exploiting how to win under these conditions. Yes it is the same "chess" but you can't really compare identically from OTB to online and with vastly different time controls to each other.
If you are trying to assess chess ability and level of understanding, then it is better to estimate by comparing their bullet rating to their other time controls (online or OTB) and taking contextual factors into account. Some players might also have a really high (or low) rating in one time control, but closer inspection reveals they've only played a handful of games and the lower sample size isn't going to be as accurate as someone playing regularly.

thank you for replying seriously, it's hard to come by these days.
I mostly agree with you, that said i still don't see these ratings meaning anything in chesswise. Fide doesn't have a bullet rating category either. In earlier times there was even no clock in chess. Game could only be won by victory.