Y Combinator, one of the world’s most prolific startup accelerators, sent a letter on Wednesday urging the Trump administration to openly support Europe’s Digital Markets Act (DMA), a wide-ranging piece of legislation that aims to crack open Big Tech’s market power. The DMA designates six tech companies as “gatekeepers” to the internet — Alphabet, Amazon, Apple, ByteDance, Meta, and Microsoft — and limits these technology kingpins from engaging in anticompetitive tactics on their platforms, in f...