i couldn't think of an use case for this? can you explain what would you use this for? if you already have pihole?

The use case is when you don't have a pihole. If you already run pihole I agree, this is not a useful addon. But what if you're at school or work with just with your laptop. Is it possible one might want run Maza instead pihole locally? I think possibly yes.

For use on a laptop that you take into other networks (coffee shops, friends houses, work / client businesses).

For use on a desktop in a network you do not control (e.g. many devs have complete local control over their own machine)

> For use on a laptop that you take into other networks

I VPN to my home (and by extension my Pi-hole server) when on that kind of network. A local ad-blocker doesn't prevent MITM or malicious DNS servers. Maza won't help if DHCP is handing out the IP for a server that claims google.com is a CNAME to hereisyourvirus.xyz or if the router is transparently redirecting DNS traffic so you don't even know what DNS server you are hitting. Which means you have to use DoH or DoT as well.

Yes, I am travelling a lot, I do not want to VPN in to my home from everywhere.

A laptop you take to work?

When you don't control DHCP (or the network as a whole)

You don’t have to control DHCP in order to use Pihole. Supplying custom nameservers at the os-level works too, as it should be.