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Then you might as well use 1.1.1.1 and not bother with VPN maintenance.

right. but the vpn allows to have the ad, malware filters on mobile

There is a 1.1.1.1 "VPN" app you know. And with that you don't have to maintain a backend.

1.1.1.1 doesn't block the advert/malware domains, you need something with a blocklist inbetween