I mean, technically speaking, a DNS is a database. I am not saying I like this idea, but are there any regulations on what you can or cannot put in TXT records?

I mean, technically speaking, a DNS is a database. I am not saying I like this idea, but are there any regulations on what you can or cannot put in TXT records? > Imagine having to pay a subscription to resolve DNS queries... Great, I won't pay for resolving googleadservices.com then :) Joking aside, I personally don't mind paying for DNS (I am already doing that using NextDNS and it has been the best DNS service I have ever used). And as been pointed out by others, DNS providers can always put a limit or hit you with a ban hammer if they want.