Not allowed
Clips of moments from a show edited together with little or no narrative, and content copied from another source without substantive changes. That is most compilation channels.
YouTube's monetization policy says channels that repurpose content from YouTube or anywhere else, without significant original commentary, substantive changes, or educational or entertainment value of their own, are not eligible. It applies to the channel as a whole - a few clips like that can cost monetization on everything.
The policy page lists what is fine and what is not, and clipping sits right on the line.
Clips of moments from a show edited together with little or no narrative, and content copied from another source without substantive changes. That is most compilation channels.
Clips used in a critical review, reaction videos that comment on the original, and other creators' footage edited with a storyline and commentary of your own.
YouTube's own wording: viewers should be able to tell there is a meaningful difference between the original video and yours.
The policy is about the channel, so the habits matter more than any single video.
For most clippers YouTube's own revenue share is the smaller part. Campaigns pay per view on the clip wherever it is posted, and their rules are the creator's, not YouTube's monetization policy. A channel can be ineligible for ads and still earn from campaigns - as long as the clips stay within YouTube's community rules and the creator's brief.
For how short-form money works across the platforms, what short-form pays. To turn a long YouTube video into Shorts, YouTube to Shorts.
Yes. The same monetization standards apply to Shorts as to long videos, and YouTube reviews the channel as a whole.
Reused content is a monetization decision, not a community guidelines strike. Copyright claims and strikes are a separate system, used by the owner of the footage.
YouTube lists reactions that comment on the original as allowed. The question is whether the commentary is real and substantial, not whether the word reaction is in the title.
YouTube lets channels reapply after a waiting period. Clean up or remove the videos that look like copies first, because the review looks at the channel as it is.
SnapDub frames each moment, captions it, and opens on the hook. Paste a link to start.