I have a lot of sites on netlify and a number of domains managed under the business tier. It would take a long time to recover if they were nuked in one go.
They really should have guard rails in place for this as well as uncapped usage.
That is the spammers' dream: shut people down for complaining. From the very beginning spammers have typically had the attitude that those they spam should "just hit delete". The more sociopathic spammers double down and spam complainers harder.
This amounts to thinking you've got a moral right to spam.
If it wasn't so easy to slide from advertising to spamming, this wouldn't matter, but that slide is easy.
They really should have guard rails in place for this as well as uncapped usage.