I would doubt whether such a clause would stand in court.
Also, agreement (which is only one of the principles which make data processing legal, but I think it is the only one which covers what Google does, using the data for advertising which is not related to the direct service) is voluntarily, that means one cannot be forced to agree by otherwise withholding the service.
Of course the latter point is not fully enforced for now but the EU is set to enforce it over time.
You have no _right_ to the service, so if you choose not to agree, they can't force you to agree, but are they required to continue offering you the service?
Yes. They're offering you the service under a particular set of terms. If you don't like those terms then the company is not obliged to adjust it's terms to suit you (assuming the terms themselves are legal in the first place, for example they don't break anti-discrimination law). In theory you could try negotiating the terms with the company to something that is more favourable for you, but as an individual you're not going to have a lot of leverage to get a company like google to offer a service that's specially tailored just for you! Negotiating is a lot more common in B2B services though, where you can have a lot more money on the table so it's worth it for both parties.
Interesting, thank you! I'll have to look that up further..
This seems remarkable (not right/wrong) to me, that a private non-essential enterprise can be forced to service a customer who does not agree to their terms of use.
There is plenty of precedent. For instance, a private non-essential enterprise is not allowed to refuse service to a customer because they do not agree to never buy anything from their competitor.
Where a company comes up with some terms that are illegal those particular clauses in the terms are unenforcable, but if the terms are within the law then they're the contract between you and the company, and both sides have to agree for the contract to be binding i.e. before the company will provide you the goods/service specified in the contract. If you don't agree to the terms then there's no agreement between you and the company, and the company is under no obligation to provide you with service.
> (assuming the terms themselves are legal in the first place, for example they don't break anti-discrimination law)
As you mentioned, GDPR explicitly states that you can't extort personal data from people by withholding service. However in the broader sense a company can refuse service if you don't agree to their terms.
Also, agreement (which is only one of the principles which make data processing legal, but I think it is the only one which covers what Google does, using the data for advertising which is not related to the direct service) is voluntarily, that means one cannot be forced to agree by otherwise withholding the service.
Of course the latter point is not fully enforced for now but the EU is set to enforce it over time.