Well, your Guest Wi-Fi can either have access to the pihole server and have its benefits, or point them to a public DNS. You can’t block access to the dns server for your guest network and hope it works - because it’s blocked. Personally I’d give Guest Wi-Fi a public DNS, as you won’t have much fun when an app of your friend’s stop working and you have to fiddle and work it out.

If you point the guest network’s dns to the gateway, that gateway needs to know what to do with those requests. Either it has a resolver locally or it mist forward it elsewhere.

I have seen the same behaviour in myself. Reddit was the only social media I used and when they pulled the plug on third-party apps, I took it as a goodbye.

I see myself sometimes opening my phone to “do something” but I have almost no apps to waste time on. I’ve reused that time to do better things, which feels nice. I read a little more here and there, I learn stuff of wikipedia when I’m on my phone, or I get up and do something else. It’s been great for me, even though I’m kind of sad to see it go. Lemmy is a great community, though I’ll try not to start using it so much, just for my own sake and not on the fault of the platform itself.