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.

"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?