Steem is free (except you should wait few weeks for registration approval), in Steem no one can edit/delete your posts.
Today it's has DTube video service based on Steem blockchain which keep video in IPFS network, more info you can read here:
https://steemit.com/video/@heimindanger/introducing-dtube-a-decentralized-video-platform-using-steem-and-ipfs
In DTube no one can edit/delete your posts and videos, like Youtube did.
Steem don't need to win over Facebook, Steem it's decentralized blockchain based censor free social network, who want can use Facebook/Youtube, who doesn't want can use Steem/DTube.