All-you-can-eat restaurant

An all-you-can-eat restaurant (AYCE) is a restaurant where any amount of food can be eaten for one price. They are often buffets.
Buffets.
Herbert "Herb" Cobb McDonald, a Las Vegas publicity and entertainment manager, introduced the idea in 1946. William Pearson talked about buffets in his 1965 novel "The Muses of Ruin":
A 2011 study showed more food is eaten if buffets cost more.
COVID-19 restrictions from March 2020 briefly closed many all-you-can-eat places.
Other restaurants.
Korean barbecue, Brazilian churrasco and Chinese hot pot are often all-you-can-eat.
Drinks.
Unlimited drinks, mostly alcoholic drinks, are "all-you-can-drink" or "bottomless", as in "bottomless brunch" or "bottomless mimosas".