That makes sense, but for me there's a huge interest in not opening a personal account, even if I could put 5k in it : taxes.
In extenso (considering you are making profits of course) you are not obliged to withdraw anything, and even if you break the rules you get the first x profit at 100% (in the case that breaking the rule wasn't the dropdown). Therefore : no withdrawal => no taxes (in my country, up to 70% taxes in trading, and they don't consider topstep/oneup as income but trading... The idea being to grow the account, escape abroad, withdraw, start a new trading life...). Anyway, that might be a dream.