This person is just posting absolutely baseless claims, as if Atlassian, a company that basically exists purely on the back of B2B SaaS sales, has not considered EU data residency requirements in their core product offering: https://www.atlassian.com/software/data-residency

Yeah I thought Jira at least was all built on AWS these days. I've never set up a Jira Cloud instance but I'd be surprised if you don't chose where your data lives.