As this project appears to be fairly unknown in the fediverse still, I’d like to use this opportunity to advertise Flohmarkt. This Fediverse equivalent of Facebook Marketplace already has some instances up and running - see here: https://codeberg.org/flohmarkt/flohmarkt/wiki/flohmarkt-instances
I don’t disagree conceptually, but English has been a lingua franca for a long time now.
That’s not an issue for brands. German and Chinese brands are just doing fine everywhere with the possible exception of the two countries in the world where people are not exposed to other languages.