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GDPR enforcement has been extremely lacking as demonstrated by the web being littered by non-compliant data processing consent forms. A compliant consent form should make the "decline" option as prominent as the "accept" one - the vast majority of services currently don't comply (including big names like Google or Facebook) and entire businesses such as TrustArc have been built on providing non-compliant consent forms as a service.
For GDPR enforcement to be considered serious, the fines amounts should be higher than the profits of companies built on abusing user data. If we look at https://www.enforcementtracker.com/?insights we can see that 1,6 billion euros has been handed out so far over a period of 4 years across the entire EU. How much does Google or Facebook profit in a year?
The entire experience of reporting violations is also a major problem and suggests the regulators (at least the UK one) aren't actually interested in enforcing the regulation. The process with the ICO requires that you first get in touch with the company and try to resolve your concern. This takes time & admin work on your behalf and a malicious actor can drag out the process for months. But let's assume that after you've done that and haven't gotten anywhere, escalating to the ICO merely results in them sending a letter. And when the company ignores that too, guess what happens? Another letter which they will promptly ignore too.
This sets the example that breaching the GDPR does pay, because not only reporting a violation requires so much commitment that the vast majority of people won't bother, but even once the violation is reported, the response from the ICO isn't actually an effective deterrent either.