Correction: the _maximum_ fine is 4% of annual income or €20 million, whichever is greater. There is also no guarantee of any fine, see vertex-four's comment.

Correction: the _maximum_ fine is 4% of annual income or €20 million, whichever is greater. There is also no guarantee of any fine, see vertex-four's comment. For something like this I expect they will simply be warned to fix their WiFi and won't actually be fined unless they continue being in violation.