As of June 2022, more than 500 hours of video were uploaded to YouTube every minute. If that video is stored at 6Mb/s, a conservative estimate, that equates to about 10TB a minute. Obviously you wouldn’t want everything, but it’s still way more than the peertube network could handle in it’s current form I’m sure. I cannot fathom the amount of data that Big Datatm handles, the fact that most of the services are free makes me highly suspicious.