That isn't Gitlab saying those are the requirements for being "open-source", it's just their requirements for who they are willing to give a generously large amount of free services to.

I think it's quite fair to say you're not going to give free services out to open source projects that are seeking to fundraise beyond covering their costs.

They’ve been saying that for a long time. https://about.gitlab.com/blog/2016/07/20/gitlab-is-open-core...