We actually have something like that in Germany for musicians: GEMA.
Unsurprisingly, it is a failed experiment. Among other things, every time you buy storage media that could be used to store music (burnable CD, DVD, ...), you are forced to pay a GEMA fee because you could use the medium for piracy (which, of course, remains illegal nevertheless). Everyone publicly playing music has to pay GEMA fees, because he might play something from the GEMA portfolio. As a musician you more or less need to join their club and pay membership fees. All the money, GEMA collects is then (minus a generously large administrative overhead) distributed among all members, depending on how big they are in the business. This means, small time musicians may actually subsidize the big names.
Unsurprisingly, it is a failed experiment. Among other things, every time you buy storage media that could be used to store music (burnable CD, DVD, ...), you are forced to pay a GEMA fee because you could use the medium for piracy (which, of course, remains illegal nevertheless). Everyone publicly playing music has to pay GEMA fees, because he might play something from the GEMA portfolio. As a musician you more or less need to join their club and pay membership fees. All the money, GEMA collects is then (minus a generously large administrative overhead) distributed among all members, depending on how big they are in the business. This means, small time musicians may actually subsidize the big names.
Just add additional paid services on top of your open source project, e.g.: https://raccoon.onyxbits.de/blog/bugreport-free-support/