> I know we’re used to having Netflix, Disney+, Amazon Prime (an even bigger range of issues there), and all these US-owned streaming services

These shouldn't really be viewed as tech (they aren't general places to find any content, unlike music streaming), instead it is more effective to think of them as studios, with Netflix being the most successful and most global, where you can find content from a huge variety of countries.

> Getting off US tech

"tech" meaning software, software as a service and hardware or actually only SaS and proprietary software?

> ..., Mailbox, Wire, Threema,....

Is it known they don't use (proprietary) US software on their servers and their non-US software don't run inside VMs on proprietary VM supervisor/OS?

Randomly checking https://www.inbox.eu/ from https://european-alternatives.eu/category/email-providers. Uses www.googletagmanager.com.