gab platform is fairly pro far-right, as is the founder. HN crowd is susceptible to tribalism just like any other group.
I thought flags weren't downvotes though...
They are.
They are sometimes, unfortunately. I'd wager there are some folks flagging a direct link from HN to a site like Gab, though.
If by "fairly pro far-right" you mean the founder regularly shared QAnon and far-right propaganda along with far-right conspiracy theories like the election being stolen, anti-vax, etc.