DMG Media, owner of MailOnline, Metro and other outlets, said AIO resulted in a fall in click-through-rates by as much as 89%, in a statement to the Competition and Markets Authority made in July.
It means publishers are not being fairly rewarded for their work, says David Higgerson, chief digital publisher at Reach.
"Publishers provide the accurate, timely, trustworthy content that basically fuels Google, and in return we get a click… that hopefully we can monetise to our subscription service.
"Now with Google Overviews it's reducing the need for somebody to click through to us in the first place, but for no financial benefit for the publisher."
"It's another example of the distributor of information not being the creator of information but taking all the financial reward for it."
There is also concern over Google's new tool called AI Mode, which shows search results in a conversational style with far fewer links than traditional search.
"If Google flips onto full AI Mode, and there is a big uptake in that…that [will be] completely quite devastating for the industry," says Mr Higgerson.

