An average person wanting to be a wrestler will have to pay thousands of dollars out of pocket to get trained in a garage by an indy wrestler, then spend several years struggling on the indies for hot dogs and handshakes hoping to get a sniff of extra work for WWE or AEW and if they do get that sniff of extra work, then it's even more years before they actually get anywhere with WWE or AEW or to make a big enough indy name for themselves that they can make money from indies.
The people WWE is generally signing now are former D1 athletes or MMA fighters or some other type of athlete with zero background that they can train from the ground up at the performance center. These people who get signed from this show will get a guaranteed paycheck while they get to spend their time training at a world class facility and if they make it through developmental they get on TV with the biggest company in the world. If they wash out, they get to start their indy journey as "former WWE superstar", already trained, already with a little name recognition.
No other opportunities like this out there for a fresh trainee with zero experience.