Yes, some contributors have websites, for example the cover bands or the group "Noorkuu" who has some great songs on YouTube, too. Some fans have Queen websites or collector pages and many have some musical background, play in bands, write songs or played guitar in the WWRY musical :-)
All songs were offered and submitted to Queenzone, nothing was downloaded from other sources. I do not know if there is another website hosting fan covers, I am not aware of any.
I do not want any google ads here.