1. https://xkcd.com/605/ Hard drives are dropping in price. That doesn't mean they will ever be zero.

1a. Youtube has other expenses besides hard drives. Bandwith. Server infrastructure. Employee salaries. To name a few.

2. It's not censorship. It's editorial judgement. Are you saying websites should be forced to host opinions they don't agree with? There is no "fairness doctrine" for sites like youtube.