While “buy from EU” sounds reasonable (and it is, in terms of physical goods that shouldnt rely on huge travels around the world), it is dangerously intertwined with protectionism.
Politicians really like the idea of protectionism, but it doesnt help in terms of software, which is a big topic in here.
Open Source / Free Software is always global, doesnt discriminate against contributors from any country (may it be sanctioned or not).
I know a lot of really shitty proprietary software from the EU that I would always trade for free software from a global community.
Yes but this ignores open source which is most of the time just good, and doesnt need to be forced to it through regulation
Xmpp or matrix are good Messaging protocols, and both are international projects.