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You said Steem, not Steemit.... and so did I. And?
Point is, Steem isn't like YouTube. Bitchute and LBRY are.
People leaving YT don't want to have to learn how to use the Steem blockchain. They want to upload videos, and watch them. Bitchute and LBRY do that. Steem doesn't.
Also, LBRY and Bitchute are free to use, like YouTube. Steem isn't free to use. (Try starting from 0 and see if you get anywhere here.)

There is 3speak as well as dtube.

People leaving YouTube want other free sites where the videos don't disappear after a few weeks.
3Speak isn't free.
DTube's videos disappear after a few weeks.

Is that true about dtube videos disappearing after some time?

If you use them for hosting then yes, your videos are replaced by newer ones uploaded to the network after a year, not weeks. But you can use other centralized service providers like youtube, twitch, dailymotion etc. for hosting as well.

Do they stay on the blockchain?

No, Steem only stores text on the chain. Dtube uses IPFS to keep videos decentralized.

Well that doesn't sound like what many are looking for...

Try starting from 0 and see if you get anywhere here.

Many do and many get everywhere, open your eyes to what the EIP is doing and stop living in the past.