It is. It’s a very left-side of the curve solution.

For months I was running it on a $5 VPS to prove the point that is cheap as fuck. I have no idea how many it has now but months ago it had about 2M pubkeys (I did some minor spam prevention but erred on the side of allowing more in)

Right now it just runs on my main bare metal server since it felt stupid to be paying $5/mo to prove a point just to myself 😂