The problem I see is that people will develop two versions of websites -- the LLM version, optimized to give the model a good impression of their products or services and get them into the training data, and the human version (with sub-versions for mobile and such) which will be SEOd to hell.

No one wins in the long run by creating technical solutions to human incentive problems. It is just a prolonged arms race until

* the incentives are removed

* the process is made so technically complex or expensive that only a few players can profit from them

* it is regulated such that people can make money doing other things which have better risk/reward

* most people just avoid the whole ecosystem because it becomes a cesspool