I totally agree with this... but MLB isn't doing that, and isn't going to do that.
I'm not sure that Schwimer's business is a good thing. But I'm also not sure that it's a terrible thing. At bottom, I guess I'm rather cynical about it - it is a very capitalistic enterprise, in a very capitalistic industry in a very capitalistic society. Capitalism tends to be predatory. This enterprise, though, has a potential negative impact on the finances of only individuals who are earning at least $570,500 per year, and who almost certainly have professional agents/attorneys on retainer.
At the same time, it presumably has a positive financial impact on some players who don't actually make the majors - so there's actually a bit of redistribution of wealth here (albeit with a healthy capitalist profit for those who underwrite the enterprise).
But BLA doesn't bleed the poor to fatten the wealthy; it may tax those who were once poor, but only after they have hit the jackpot. For those who may be poor, and who never hit that jackpot, it's a windfall. BLA is capitalistic, and as such it aims to obtain a significant profit - but it beats the heck out of capitalist enterprises that bleed those who actually are poor, and that do nothing for anybody except wealthy investors.
As capitalist businesses go, I can't see BLA anywhere near the top of the list on grounds of "predatory practices."