Holafly (and other "travel" eSim providers) have been caught routing traffic through China.

https://www.itnews.com.au/news/travel-esims-secretly-route-t...

That article seems bogus.

IP blocks are routinely bought and sold, and hence their geo location database entries are not reliable.

If you’re physically in the EU or the UK and your traffic is routed through China it would be unusably slow and immediately noticeable to non-technical users.