Lmao, the bm2500 myths are hilarious.
I'll summarise quickly, there ain't no one persistent hack and the ones "offering" such accounts are unscrupulous scammers and snake oil merchants. The people falling for it are naive suckers. Do not be a sucker, instead, think and read.
Bm2500 are earned via agencies, not sold.
Imagine you're working there and somehow your boss told you to make sure you get some, it'll take months, kyc, no chargebacks etc. Keyword months.
Let alone the investment, time, payment instruments, being careful on what's advertised etcetc.
Now what are the chances some agency employee will pass this on to you for any price only so you can go and fuck up his entire company trust with your little advertising campaigns? Risking his job etc and these accounts aren't transferable so at best they might be running the campaigns for you, how realistic is that? If you try to log into something like that, kyc and all are immediately reset, adding a non company person to the workspace will not fly.
So they had to do all that to let you screw it up and now they need to repeat the who process just to start from zero.
Now ask yourself what'd be a reasonable fee to provide that service?