well like you said it applyed to pool operator which are the one that give money to the miners, so in that case for them below 600 there is no tax to pay
Please stop confusing people and providing bad information. The $600 is a form requirement, nothing to do with taxes. For the miners, it's income, they declare it and pay taxes no matter the amount. For the pool operator, it's gross income so would be declared in their P&L, but the payouts are a business expense so would reduce net income and corporation taxes.
well i'm lucky that i live not in the usa, and in the europe where there is a roof under which you don't pay nothing, which is 4800 in my case
it seems wrong to force everyone to pay taxes, even those that live in poverty, there should be a better distribution of the taxes there...