Again, it's a snowball effect.

Students and amateurs want to learn how to do something. Their choices are either - (sometimes) get an EDU address, fill out a form, apply for a discount or free version, see the watermark or lose a ton of functionality, and only see tutorials via classes or other a-la-carte method (how many folks are doing Houdini lessons online out there - probably not many if I had to guess considering Houdini's price), or start paying $20/month for a program that they someday hope will allow them to earn money - knowing that if they stop paying, they lose access to files... OR...

They can download a program for free, that anyone can add stuff to, with thousands of really well done tutorials online on free places like YouTube, that studios will love because there's no licensing fee or if there is - it's only when they are really profitable or whatever.

The more that people use it, the more there are people doing tutorials, expanding functionality, etc.

Blender used to be garbage in like 2010, but now - you'd be an idiot not to grab a copy and teach yourself if you used to regular in apps like 3DS Max, Maya, or other premium closed application now requiring a bunch of DRM installers, license tiers, and subscriptions...

Same goes for Adobe's stuff. I imagine there are more and more people sick of Creative Cloud's garbage and are ready to find and learn and contribute to FOSS services... All that needs to happen is critical stupid event by bigwig, and suddenly a mass exodus begins.