>> those rejecting modern tools like GitLab are gatekeepers,
Would like to mention one subtle nuance here. Over at ardour.org, we *refuse* to use non-self hosted systems like Github/Gitlab as our *canonical repository*. We believe that historical experience at sourceforge and direction at github confirm the wisdom of our preference for self-hosted options.
However, we are happy to use github as a public-facing locus for PRs.