The terms of service doesn't matter in the context of anti-competitive practices; if scraping becomes a key requirement for the development of certain services, Google can undercut all of its competitors by using its own system.

This may seem 'fair game' to you, but it's not, it's anti-competitive, and for the same reason the Supreme Court ruled against Microsoft with regards to the competitive advantage it had with Internet Explorer before Firefox and Chrome came around.

https://en.wikipedia.org/wiki/United_States_v._Microsoft_Corp.

And that wasn't about forbidding--that was about merely inconveniencing.

Edit: It says it was 'partially overturned', that doesn't refer to the ruling that Microsoft was doing something illegal, it was referring to the order to break up Microsoft into two companies. That part only was overruled.

The landmark ruling resulted in the ability to develop browsers like Firefox and Chrome through Microsoft being forced to open and document its APIs, which crushed Internet Explorer.