Prior to Listmonk I used Mailtrain[0] and like Listmonk so much I want to run it as a service (with 30% donated back to the Listmonk project of course) -- deliverability worries and initial setup aside it's just the kind of minimal tool I've come to love these days.
Hey hardwaresofton, this is exactly what we're planning to do on https://srv.io/ :)
The platform is mostly ready, and we're just finishing some infrastructure changes to allow the platform to run third-party applications safely. We are planning to include Listmonk in a second batch of the applications to release.
I personally enjoy working with Listmonk, it has replaced Sendy[0] for me.
[0]: https://sendy.co/
Glad someone else is thinking along the same lines! F/OSS could be so much better with the help of platforms — there’s space for a win win as long as the platform side just pares down the greed a tiny bit.
Just the other day I was wondering why there aren't "software maintainence/repair shops" as there are for hardware (PCs, gadgets, appliances). A tech shop like srv.io is exactly what I was wondering existed. Surely there is a market for it. I wish you (and your competitors) all the very best!