The way I see it, there may be pain now, but this is just the chaos before the web eventually becomes the semantic web, as mostly conceived by Berners-Lee[0]. Make all data available for true, easy, permanent open access instead of throwing up roadblocks to be circumvented, so all organizations wanting to train AI models can access, and thus properly democratize the ecosystem. It's that or end up with a handful of players with pockets deep enough to do what it takes to get the data, and then gatekeep the results for their own profit.
Also, eventually I see most people filtering their queries through something like Perplexity anyway instead of going to individual sites, so those putting up barriers will lose out on human traffic in any case. Let's ensure that the results people are able to access via AI continually improves so the "slop" term disappears that much faster.