There have been multiple accounts created with the sole purpose of posting advertisement posts or replies containing unsolicited advertising.

Accounts which solely post advertisements, or persistently post them may be terminated.

Omniraptor , (edited )

To be fair it’s not a mysterious “they”, it’s just an option available for channel owners to set alternative thumbnails and then check which does better. I don’t think YouTube does this by itself if the uploader doesn’t enable it

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