Yeah no.
Pointless re-inventing the wheel. Help with some existing project instead. NPM needs some help, few bugs to fix and a little bit of added functionality to make it perfect.
AdGuard Home.
Aside from other stuff mentioned here about email. I always assumed I'd become a target for spam that I'd have a harder time filtering out to the point it stops being worth it to have a custom email address.
Can't work out how or why hosting it at home would mean more spam? Your email address gets on a list that gets pulled by spam merchants, hosting it at home doesn't make any difference here.
DietPi. I have quite a few VMs running DietPi, very light, simple, "just works"!
I have to reluctantly use Docker which is cumbersome, awkward and confusing in comparison. A DietPi VM is simple and easy to run, use and more importantly, keep backed up. I really hate being forced to use Docker when DietPi exists and works!
Most definitely a scam. Website shows a different URL to the domain and the phone number is formatted completely randomly.