Selfhosted
A place to share alternatives to popular online services that can be self-hosted without giving up privacy or locking you into a service you don't control.
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Spitballing ideas:
You may be already aware, but be mindful of the danger associated with having an ounce of responsibility for their DNS uptime. The bonus of option #1 is that you could also empower your friends to "bypass" PiHole should it go belly up.
Edit: Don't do #1 unless you can properly secure it.
DO NOT run a public DNS resolver. It'll get used as part of a DNS amplification attack, and your system will be used to DDOS somebody else.
The only viable solutions here are to either have OPs friends VPN all traffic through OPs network (there might be a way to use split tunneling to reduce total traffic used, though I'm just spitballing here), to deploy hardware locally on their network, or to use a public solution. Everything else is going to be a security risk.
Thanks for the explicit mention, I should have been less vague with my "planning the security aspects" comment. I was thinking firewall rules would mitigate that, but could moot if the friends are on a dynamic lease.
VPN is a bit of a non starter since that would require installing and running a VPN client 24/7 on all devices, else you're dropping in a site to site VPN device on the network... At that point you might as well cut out the extra complication and just run PiHole on that point.
I actually learned about public AdGuard servers in this thread! I'd definitely lean that way if I were OP (because I personally do not want to field "the internet is not working" calls in the middle of the night).