Because HN has become much like X, with an aggressive pro Trump element abusing the system.

People claim it's because its due to "irrelevant politics" but HN is probably 70% off topic subjects, tangentially connected to tech, etc. But no one is flagging these other off topic posts.

I can also see it in any comment I make which doesn't conform to right wing dogma getting voted up in the EU time zone, then getting voted down in the US timezone.