At it's heart, this is what @selfhosted is meant for:

A place to share alternatives to popular online services that can be self-hosted without giving up privacy or locking you into a service you don't control.

I would say that members talking about paid/closed products they use (ex. "I connect to this via Tailscale" or "I use company ABC for hosted VPS") to accomplish something is fine, but marketing or job boarding (ex. "Looking for QA on my commercial product") is not.