They do offer that deal to others; a big news story was when OpenAI bought Reddit's data they were selling: https://openai.com/index/openai-and-reddit-partnership/

yep, but for things which are "only" search engines it's not a viable offer. Only if you expect "big AI business value" from it does it make sense, maybe.

I don't see how this tracks at all. Companies can decide to only sell their products with some retailer if they want. You can't force them to make deals with other companies.

You certainly can in monopoly situations (which apparently this isn't the case).

Most business deals are anti-competitive in some way. What makes you think this specifically rises to the level where they'd legally have to offer similar terms to competitors?

I’m not sure. Maybe the angle is that Google is anti-competitive by signing an agreement that limits information to it’s rivals.

Being forced into using google services, because they are paying information companies to deal only with them seems like a disaster for the web.

Why in the world would they have to do that? There are thousands of exclusive business-to-business deals being signed into action every second of the day.