It's a group that by the nature of their production cycle is very exploitable (you have to sell the harvest or it litterally turns into manure), and yet they are extremely essential to a population's survival (unlike e.g. hairdressers, no food ruins your month in a way an overdue trim can't match).

So you want to keep farms up even in times the market wont.

What makes them a singular category in this regard? Genuine question. Virtually all agricultural sectors enjoy some form of subsidy, for what I think are obvious reasons. Likewise it's not like the idea of government money going to less-than-optimally-productive labor is unheard of.

No, that's major US finance companies...

That’s the case in the US as well. What do you think agriculture subsidies are?

If you want countries that don’t subsidize agriculture that has been Aussie and NZ since the 80s iirc. Though I haven’t lived in those countries for a decade or two now and Covid and various financial panics over the last decades resulted in a variety of corporate hand outs so it seems plausible that those businesses have got some government support since then.