Thank you for the answer Richard,
the opt-out was exactly what I had in mind, but I didn’t knew that copyright trick of the map vendors. Is that just a “theoretical” problem or are those tracks tagged, even when you export them to gpx? I guess this is already discussed exhaustive, I will use the search for that.
I don’t feel like editing all that tracks uploaded to my site, but I saw it is possible to apply appropriate tags to gpx files.
Thanks again
Peter