I do it because for me, it's going back to the start after some bad times personally.
Nearly 11 years ago i was studying digital media and got my qualifications, there were 2 main project guys in that class, myself and another guy. All my projects won awards but i totally fell out of love with the whole thing and gave it up. He went on to become a top (and i mean, TOP) media guy who does music videos for some of the biggest artists in the UK and TV work. I totally wasted what ability i had chasing other life avenues that didn't work out too well, lost my father, suffered illness, depression etc.
11 years later, after getting into watching others on YT i decided to finally do something and try to draw on what i used to do... except all the software was obsolete now so i had to relearn everything but it got me familiarised with it all at least and i put up my first video in November. It's over a decade but finally i'm back doing what i know i can do, and knowing how hard times can be and how videos can brighten peoples days, that's what i hope to do, even if it's just one person you take problems away from for 20 minutes, you've done a good thing.