Sure you could use someone else's DNS, but then you'd have to trust them. 

I set up my pihole 3 years ago and have barely had to interact with it since. The most I have to do is update it when I feel like. It's made a major difference in my internet experience.

I still use an adblock on my phone/browsers for when I'm not on my home network. 

random_

Pihole can mess up badly your network if is not configured correctly and/or user don't know shit about networking. Pihole is not the panacea of cleaning shit of what you are doing.

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saloon

no, you can use:
- specific dns providers that already have clean the shit
- specific firewall servers/apps/hardware that not only clean the shit but also keep safe your network and do other stuff
- specific browsers that already clean the shit.
- stop browsing shit pages.

Pihole can mess up badly your network if is not configured correctly and/or user don't know shit about networking. Pihole is not the panacea of cleaning shit of what you are doing.