We just transitioned to Bitbucket, and I've been using confluence and jira all week (including today) with no issues. There may have been outages and latency, but it's not been "down" for 4 days.
It seems the outages have been isolated to specific instances. Not everyone is having problems but a significant amount of customers have been "down" for multiple days.
Why? It's been years since I've heard anyone transition to Bitbucket. Self-hosted or SaaS, even companies that have fully embraced Atlassian tools don't move to Bitbucket. There are much better options out there, in terms of features, speed and reliability.