It seems it's all random.
From Admin:
"It doesn’t effect anything. The system just random but based on the quality of the academy.
No distribution system."
So, any banned teams should not impact the quality of academy players; the increased number of best academies should not impact the quality of academy players; the source ( money or tokens) should not impact the quality of academy players ( but it does provide more chances of getting a good player).
I also find it odd that I was getting better players some 12-15 seasons ago, but if Admin said there is nothing wrong with the script and nothing was changed, then we should believe him and just adjust to lower LA players. After all, we should all be in the same situation