Earlier quoted context omitted.
is there a way to run this pi-hole on cloud so, multiple users can use it , and also while using mobile data ? also, for those who do not want to spend on / does knot know to fiddle with RPi.
This should only be done in combination with a VPN. Open DNS points are not generally recommended Check out nextdns instead. It can likely do what you had in mind
is AdGuard also a similar approach ?