Probably not that tense. A lot of enterprises with Very Big Licenses are hard-locked into Atlassian products with little to no chance of changing.
Nobody has either the time or the will to switch because, while all the software kind of sucks, it doesn't suck enough to the point where someone is going to stop working on their product and/or service to jettison Atlassian from their org.
I have a lot of awful things to say about GitHub Actions but it's probably the best fit for our team.
However those orgs often have a Very Big License for GitHub Enterprise, and therefore with some enterprise porting tools it's not that high friction a switch (supplier managers will be all in favour; one less contract to manage!)
Then we switched to BitBucket Server because it integrates better and cost a lot less, plus GH Enterprise was a weird black box VM back then that we had to hack into to make work for whatever reason.
I couldn't point you to anyone who likes BitBucket Server, but as long as you're on the CLI and don't have to use the terrible web UI too much, it sort of works.
E.g. https://www.slintel.com/tech/source-code-management/github-v...