Are YouTube creators using "enjoy" in a new intransitive sense?
The OED has in the entry for enjoy:
OED mentiuons that "Enjoy!" is not intransitive:
Draft additions March 2003
[In later use, probably after dialectal Yiddish genist.] In imperative, with ellipsis of object: take pleasure in the thing (frequently food or drink) being presented.
1876 H. James Roderick Hudson ix. 304 Don't mind the pain, and it will cease to trouble you. Enjoy, enjoy; it is your duty.
1959 H. Golden For 2¢ Plain ii. 92 When my mother served our meals..she would always say, ‘Enjoy, enjoy’... The word ‘enjoy’ was seldom used by itself. It was always repeated.
1998 30 All Time Great Recipes (BBC Good Food) Autumn 1/1 We hope that in this selection, you will rediscover some old friends—and make some new ones as well. Enjoy!