it's not 1:1 you just can't get more than negative 100GB... but even then making sure people keep or try to keep good ratios is the best way to keep the torrents healthy and fast so i consider it far from idiotic.
It's a flexible 1:1 system. It has no ratio difference. If I've downloaded 300TB of stuff, the maximum difference is still 100GB. On a ratio system, like say, a 1:2 up/down, I could have a 150TB difference having uploaded 50% of my 300TB.
It's hugely flawed because it doesn't count for the bandwidth debt that occurs when you don't have leechers. Eventually, there will be one person stuck unable to seed because the file is no longer in demand.
I would prefer if the site were left open and ratio restrictions taken away. You can' seed something infinitely if there are no leechers. Trying to eliminate leechers is about as dumb as trying to eliminate interest in a stock market. Torrents are self sustaining, just like a free market, and it should be left like that. Trying to regulate breaks the whole system.