It's not really that expensive. GitHub Enterprise is like $21/month/user while GitLab Ultimate was $100/month/user the last time GitLab published prices. These days GitLab Ultimate is "contact us for pricing" while the cheaper GitLab Premium is $29/month/user.
I guess Bitbucket is cheaper but you'll lose the savings in your employees bitching about Bitbucket to each other on Slack.
Do we work in the same company? That said, I really don't understand why everyone hates on Bitbucket. I really thought it was _fine_ from a user perspective. Now we're on GHE and I find it a sidegrade at best.
Now for the people who were operating Bitbucket, I'm sure it's a relief.
I guess Bitbucket is cheaper but you'll lose the savings in your employees bitching about Bitbucket to each other on Slack.