It loaded several times without an ad for me. So maybe they don’t have ads for Germany yet and you should try a VPN?

It’s hard to avoid, though. To my knowledge there’s cumbersome solutions like run an Icecast2 proxy and just proxy it 24/7 so you won’t reconnect. Or re-program your internet radio to start the stream muted and unmute after 30s.

Edit: Forget what I said, it does German language Shopify ads now. Not every time, but some of the times.