You forgot the biggest reason.
People CAN work for free.
Afterall, we have a safety net so people don't starve and plenty of families are well off enough that they can support people who want to work for free for a bit.
Though people did this stuff for free all the time before too... it was called a hobby. The difference was they weren't enabled to pursue it with more then part time.
Like Einstein... and for every Einstein there were a dozen more failures no doubt.
A lot of the past's scientists were rich kids who loved science and worked at it for free. That was a case of the opposite really, a traditionally "free work" action getting monetized.
For example... Darwin. Did Darwin even have a job?








