Presumably the usage of humans stays relatively constant and costs for infrastructure increase 5 to 10x.

Just means you just pay out 1/10th as much per traffic; you already had some estimator for signal to noise measuring buying likelihood. It's just gonna drop

As long as humans keep using the internet I can’t see it mattering too much. Has this impacted the amount people who are using social media I wonder.

That depends to a large extent on whether & when the bots will be endowed with spending power.

Hopefully it goes to zero

Maybe if the internet's value is absolutely destroyed we can start over. Or just bury it in the past