The credit cards points blogs and forums are ruthless about abusing any signup bonuses and loopholes that can be found. The amount of outright fraud being encouraged on the forums (though not the front page of most blogs) is eye-opening to anyone who ever thought you could trust your users to do the right (or even legal) thing.

In cases like this, though, it seems clear that Brex was abusing the abusers: They knew the signup bonuses would create a signup frenzy and likely viewed it as buying their way to the numbers they needed for the next funding round.

Not only that, but the deal terms and conditions quite explicitly didn't include industry-standard rules limiting bonuses to one per person... many many many people got multiples.