Romance absolutely rules my For You page. I'd say fantasy and romance together are the undisputed power couple, but honestly, romance on its own is the heavyweight champion. You see the same sub-genres cycling through every week—enemies-to-lovers fantasy romances, dark mafia romance, why-choose reverse harems, hockey romance with a side of cinnamon roll heroes. It feels like every viral book has a love story at its core, or at least a major romantic subplot.
A thriller will sometimes break through, usually with a twisty unreliable narrator or a 'gothic academia' vibe, but even then, the comments are dissecting the love interest. I guess it makes sense; BookTok thrives on intense, shareable emotions—betrayal, yearning, grand gestures—and romance is built to deliver that. My own TBR is basically a monument to this trend.
Sometimes I wonder if the algorithm just feeds us what we engage with most, creating this self-fulfilling prophecy. Dark academia fantasy had a moment, but the popular ones were always secretly romances in a fancy library disguise.