> Why can’t a company in the EU make a secure video/voice chat app?

What makes you think they can't?

Microsoft's corporate edge isn't merely the product, it's also an army of sales, entrenched corporate markets/clients, lock-in, etc.

You could have a better version of their product and still get eaten alive.

In the Netherlands, a lot of government systems aren't procured from the Microsofts of this world. There are a lot of middle men (consultancy agencies) involved that over the years have helped build a strong ecosystem with lots of expertise around Microsoft and related suppliers.

So indeed, it's not like you can just replace a software product (or service) by some EU or open alternative. And there are huge vested interests.

And don't forget Copilot! ;-)