The first GDPR fines handed down by the ICO have been hundreds of millions of pounds for negligent breaches - I don't think it would be out of the realm of possibility for breaches by _design_ to result in multi-billion pound fines.
Several billion pounds is still not much! They already broke GDPR once (or twice I think?) And received a 57MM$ fine.
57MM$ is nothing to Google. They've escaped even antitrust cases with minimal injury, it would be a truly shocking event if the EU actually managed to touch them.
