We really need tech monopolies like Google to be regulated, in order to stop abuses like this.
Back when our anti-monopoly legislation was first introduced, that wasn't the case - monopolies were busted just as well because they did something anti-competitive, even if that was presented as benefiting their customers (and even if it really did, short term).
the best way out of this is to educate users and start getting them to use other search products. we need more diversity of choice.
Probably not enough to matter, if you are only looking at the UK.
Everyone has the right to revoke consent at any time.
Additionally, why do you believe Google is a monopoly, and in which line of business?