Maybe but maybe not. I don't like Bitbucket but there are a number of large companies where they worry about using services owned by competitors in one of their verticals.
Not sure what you mean? If you are alluding to the OP that said it was surprising...I don't think he found it suprising they they use Bitbucket over Mercurial. I think its safe to assume he meant bitbucket over a Github.
In the git universe there is a pretty short list of services, locally or hosted that you would probably use as an entity as large as cloud flare.
"Since the Smartsheet service account had administrative access to Atlassian Jira, the threat actor was able to install the Sliver Adversary Emulation Framework, which is a widely used tool and framework that red teams and attackers use to enable “C2” (command and control), connectivity gaining persistent and stealthy access to a computer on which it is installed. Sliver was installed using the ScriptRunner for Jira plugin."
