I ordered a Raspberry Pi 5 so I have a Pi 3 that’s about to be redundant. I haven’t used Pi-Hole so I was thinking it’d be good for that but I’m curious if there’s any downsides for users. Are sites blocked if you dont whitelist them? That sort of thing.
Basically, I’m not worried about me having issues but I’m worried about a maintenance headache if friends and family can’t access things.
Depends on what lists you add to pihole (or adguard).
The default lists for both are primarily advert or tracking related, and very safe to keep. The only time I whitelist is when I'm following some kind of shopping deal that uses a tracker. Most linux related things are free from that.