I follow a few researchers with interesting youtube channels, and they often mention that if you ask them or their colleagues for a publication of theirs, chances are they’ll be glad to send it to you.
A lot of them love sharing their work, and don’t care at all for science journal paywalls.
Other than be happy for that attention and being curious of what extra things you can find in their field, they get quoted and that pushes their reputation a little higher. Locking up works heavily limits that, and the only reason behind that is a promise of a basic quality control when accepting works - and it’s not ideal, there are many shady publications. Other than that it’s cash from simple consumers, subscriptions money from institutes for works these company took a hold of and maybe don’t have physical editions anymore just because, return to fig. 1, they depend on being published and quoted.
Sure, that’s a motivation too, but they were also talking about random people who’d find a reference and were curious about their work, not just other researchers who may quote them. It’s not all about h-index.
When a guy literally makes, among other things, regular paleontology news reports and whole videos of his own university course material during summer breaks, and puts all that to youtube it’s safe to assume he just likes popularizing his subject.
