You all must know that each video has value. This announcement was made suddenly, with a time limit of only two months. It is not acceptable to leave it up for years and then suddenly delete it.

If you were able to move it to another site, you would not be able to leave the comments that accompanied it. The strength of the digest is that you can rewatch the stream with the comments. There must have been a reason why you chose to leave it in the digest, such as it was interesting or moving.

Aren't these videos a unique treasure for Twitch?

Instead of deleting them, consider preventing any more digests from being uploaded.
At the very least, give time to the streamers who are struggling to keep their videos.
If the digest feature is not being used, you could have promoted it or changed the UI to make it easier to use.
Instead of repeatedly adding and deleting features, shouldn't the Twitch platform be able to make effective use of the features that are currently available?
You don't want to hand your users over to YouTube.
The history of Twitch is there.
Could you please reconsider?