Re: @Handy Plough
Indeed.
If you want to find evidence of abuse by Google, look at their advertising agreements and ask "are Google saying you can't advertise with other search engines?" Look at Android and ask if they are preventing people from feilding phones based on other OSes if they choose to feild a Google-branded Android one. Can they feild a Fire-based and an Android-based phone at the same time?
"We are advertising our services on our own website while we also give others the ability to advertise on our own website" is not abuse.