There are other forums where politics is the thing.
Unfortunately, many events which in reality exist with or without politics (like race-based hatred) are tagged with the political label. This also makes these events harder to discuss in an objective manner because an element of partisan thinking enters the fray: "does my party support this or not?" vs "do I believe this is right or not".
EDIT: There have been many front page posts about the genocide of Uighur Muslims in China. Is that considered political as well?
"Everything is political" should not surprise you, it's not a new concept.
On-Topic: Anything that good hackers would find interesting. That includes more than hacking and startups. If you had to reduce it to a sentence, the answer might be: anything that gratifies one's intellectual curiosity.
Off-Topic: Most stories about politics, or crime, or sports, unless they're evidence of some interesting new phenomenon. Videos of pratfalls or disasters, or cute animal pictures. If they'd cover it on TV news, it's probably off-topic.