you don’t want a free tier. what you want is reasonable usage based pricing and scale to zero.

all the actual tiny projects on free tiers have actual costs approaching zero. everything else shouldn’t be on a free tier.

if it’s not possible to monitor usage (not billing) and automatically unplug dns if usage spikes above some threshold, it’s probably not a good provider. having confidence that some project will never cost above x/month is a reasonable ask, and not challenging.

hint: use aws. like python and linux, it's not very good, but everything else is worse.