The rallying call to put European tech first — backed by companies including Airbus, Element, OVHCloud, Murena, Nextcloud, and Proton, to name a few — follows the shock of the Munich security conference, where U.S. Vice President JD Vance tore into Europe like an attack dog, leaving delegates in no doubt that the post-War international order is in tatters and all bets are off when it comes to what the U.S. might do under President Donald Trump.

Key tech infrastructure that’s owned and operated by U.S. companies doesn’t look like such a solid buy, from a European perspective, if a presidential executive order can be issued forcing U.S. firms to switch off service provision or terminate a supply chain at a pen stroke.

“Imagine Europe without internet search, email, or office software. It would mean the complete breakdown of our society. Sounds unrealistic? Well, something similar just happened to Ukraine,” Wolfgang Oels, COO of the Berlin-based, tree-planting search engine Ecosia — one signatory to the letter that was already taking steps aimed at reducing its dependency on U.S. Big Tech suppliers — tells TechCrunch.