Does s/he implicitly trust Atlassian?

If anything, that comment makes it clear to me that they're staying mobile because they don't implicitly or explicitly trust any of the current providers.

I think if they implicitly trusted someone, they'd just migrate to them immediately - why wouldn't you?

I don't. I use jira at work. It's shit.

You missed the point of that comment

The reason you can trust Atlassian a bit more because they have more narrow focus on dev tools so less chances that they could become a competitor. Unless you’re developing another (git/bit)(hub/lab/bucket)