Not such a strange combination in my view. As i see it, Google's customers are (for a large part) advertisers, and their product is the ability to get ads in front of people (and to get people to click on them). In the economical sense you could even argue that Google users are 'suppliers' (of eyeballs and clicks)

Monopoly abuse can of course impact both suppliers as well as customers, but in this case it's probably more likely to only impact advertisers.

- As individuals we can switch to other search engines and browsers, so it's difficult to abuse a monopoly that way.

- However, as long as we keep using Google, advertisers might have no other option to get a reach this valuable. So Google could possibly exploit its position towards advertisers. (e.g. Favor its own ads over other ad networks).

Still looks like a net win for end users.