Coincidentally thats my setup rn. Hosted my domain dns myself using technitium. Then i further xafr icann root zone and setup dns over tls. The dns over tls queried the local icann root zone copy i got. Its also blocking ads and tracker craps. Basically self reliant dns.

Can be done with bind9 too but i prefer technitium gui than bind9 cli.

Cost and privacy. Currently selfhosting adguardhome. Something like nextdns or controld cost like $35-40/year. Mine cost nothing monetarily since its hosted on oracle cloud free tier. Only costed me like an hour or two of my time to set it up. Plus i don’t trust them enough to not sell my browsing habit.

Windscribe vpn. Got a special account for $10/year. Can’t really selfhost vpn on 100+ location with $10.