I have a real bad intuition that I hope that some organization of college administrations have thought about, and have installed a solution or are working at it.
Let's say that you are a "rich" program as far as donors to NIL Portal meddling is concerned. Plus, you are in a conference where you have an opponent that is consistently a problem, but is not as rich. If I wanted to run a long view plan which was exceptionally dirty, I'd bid on their stars, forcing them to up their "budget." Let them win the bidding war. Sooner or later they run out of donor willingness to keep upping the "contracts", but are stuck with the heavy ones they have. You've spent nothing, but you've crippled them. Now you can outbid them anywhere else you want and shut them out. If they give up earlier on a big star, well, you won that too.
In that world, free market with no restraint, the biggest money man always kills the lesser.
Don't like the image. Hope I'm missing something about "time-honored" killing the prime competitor behavior.