The modern obsession with "avoiding spoilers" is not universal.
That's not even a thing. Misconception.
People love spoilers, for the most part. They won't admit it (fashionable contrarianism and all that), but research and focus group testing shows that to be the case. Movie trailers that have clear spoilers are more effective at getting people to come to cinema and talk about the movie before it is released. Romances often signal clearly who the true main couple is, no matter how insane the story itself turns out to be and how many twists there are. Isekai protagonists are usually practically invincible with plot armor, if nothing else, and are rarely put to a genuine risk and losing something of real value.
Only place where spoilers are considered bad are real mystery stories, where the whole point is to try to figure out whodunit or what is going on. If we're talking novels or manga, things like Re:Zero go to this pile, or romances that have a genuine love triangle with two fairly legitimate options, resulting from something like amnesia or deep-seated trauma that is incredibly hard to get past of. For yuri stuff, that's something like Letink's "Re-Blooming".