Any reason I'd use this instead of Sourcehut [1] ?
Sourcehut ticks all of the boxes for a well-run project: Open Source, good engineering, sensible financial plan, excellent maintainer who works well with others, and constant, sustainable progress.
Sourcehut is also accumulating lot of support for niche things that other providers don't support at all: e.g. it is a Mercurial host as well as a Git host, and the CI supports BSD OSes.
It has its own very hacker-oriented aesthetic and tries to keep the various components it provides separated so for things that are "close enough" you might be able to bootstrap off their tools.
Also, the concept of a CI system where a failed build sticks around for a while and lets you ssh in to figure out what went wrong is -way- cool.