You don't invest in a company without expectations of ROI
Edit : of course, it seems their doing a downround, so those expectations are not in good shape either.
When a DJ is spinning in a club or venue however using someone else's content is covered by the venue in the form of fees paid to ASCAP, BMI or some other such publishing rights society.
This is not true in many parts of the world.
See:
https://en.wikipedia.org/wiki/Performance_rights_organisatio...
https://en.wikipedia.org/wiki/List_of_copyright_collection_s...
https://www.ascap.com/help/international/affiliated-foreign-...
Its up to the artist to register with a PRO or to affiliate with a publisher that will do so for them. ASCAP despite the A in the name will collect performance rights worldwide and anyone that meets the basic requirements is welcome to join regardless of what country you live in. See:
http://blog.songtrust.com/uncategorized/ask-songtrust-publis...