it's free for newbies and everyone, ofc it's a trap but freemium model gets people. aws can cost easily few thousands with 2-3 mistakes and clicks. vercel makes you start free then if you grow they bill you 10x-100x aws

I dunno I put a lot of traffic through Vercel, maybe 100k visitors per day, and it was under a few hundred a month. I think a couple EC2 instances behind a load balancer would cost similar or more. I was under the impression that its still a VC subsidized service.

They regularly try to get me to join an enterprise plan but no service cutoff threats yet.