This is the weird world of Cameo, a platform selling “personalized videos from your favorite stars” to people like Luke’s brother. Cameo offers videos from all kinds of celebrities, especially if we take that word to mean anyone who has ever been on TV. Chuck Norris, David Arquette, Antonio Brown, Fabrizio Romano, supporting actors from the “Harry Potter” films — all are available to wish your loved ones well on command. The price can be steep for better-known talent; Caitlyn Jenner’s videos cost $2,500 and up (to benefit her foundation), and Mariano Rivera’s start at $750. Niche stars might charge under $100 or as little as $15. There are Instagram-famous comedians and TikTok ventriloquists; an array of Real Housewives and 90-Day Fiancés; a guy named Rob Franzese who makes videos because he resembles the cartoon character Peter Griffin from “Family Guy.” Even zoos have gotten into the mix: I once bought my younger brother a happy-birthday video from Dunkin the two-toed sloth at the Staten Island Zoo.