alt Hacker NewsUS level anti-trust laws don't touch on a lot of anti-competitive behavior, mostly specifically it almost solely concerns just trusts and monopolies. I don't think I've heard of a court case ever before simply on the death of a product.
But also US anti-trust laws at the federal level have always relied on a strong FCC, FTC, and US Attorney General's Office to execute, all of which are currently neutered and/or understaffed under the current administration (and may take years to recover even in the best case scenarios). The US has decided it is a season for trusts and monopolies.
(See the mergers of Paramount and WB into Skydance consolidating 200+ combined years of movie history into a single monopoly under the Oracle nepobaby and almost directly undoing/mocking one of the largest and oldest anti-trust cases which was US v. Paramount Studios which set precedents for how large a movie studio could grow that lasted almost 100 years.)
(There might be something the state of California could do, but I don't know how much they want to get involved.)
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California has chosen not to get involved - they threatened to then backed down.
US v. Paramount separated movie studios from movie theaters.
Sumner Redstone came from a movie theater family and formed modern Paramount by buying Viacom (which was spun out of CBS due to antitrust), Paramount, and then later CBS itself. He was able to buy Paramount as a cinema owner because the government abandoned the rule that you couldn't own both the studio and the theater in the 80s.
The corporate history of Hollywood is long and complicated. Skydance is obviously a big topic this month, but Paramount was owned by the Redstone family's National Amusements theater for as long as many of the adults on this site have been alive.