Experts say a campaign of legal and political pressure from the right has cast efforts to combat rumors and conspiracy theories as censorship. And as a result, they say, the tools and partnerships that tried to flag and tamp down on falsehoods in recent election cycles have been scaled back or dismantled. That’s even as threats loom from foreign governments and artificial intelligence, and as former President Donald Trump, who still falsely claims to have won the 2020 contest, is likely to use the same tactics again as he pursues the White House in 2024.