it's an add for apps that cost as much as a box of decent used pedals and rack mount gear. though "linux musicians" does appear to be a thing, and the bot used to check if you are human, is amusing and fully automated.

https://linuxmusicians.com/

I actually assumed the link was linuxmusicians.com and I bet I am not the only one who assumed that. It is not an ad, but a store that also lists free software.