Someone paid for those free-to-air broadcasts. They reclaim the money from advertisement. For example, in Germany, ARD and ZDF paid €152M for the rights to air the 2026 World Cup. To answer your question: any stream from non-ARD/non-ZDF source, or a source not directly sub-licensing the stream from those two, is an unauthorized stream.

You can't just put it up on the internet because it "came free". Putting a German stream for viewers not physically in Germany would be even worse.