Earlier quoted context omitted.
I explained in the next sentence what makes me expect this: "Many of the less serious ones I read explicitly mentioned warnings that were ignored."
Many, but not all of them said this. Given that GDPR has absolutely no requirement that warnings be issued, it is not reasonable to expect that warnings were issued and/or ignored in cases where it doesn’t specifically say this occurred.
Each supervisory authority shall ensure that the imposition of administrative fines pursuant to this Article in respect of infringements of this Regulation referred to in paragraphs 4, 5 and 6 shall in each individual case be effective, proportionate and dissuasive
When deciding whether to impose an administrative fine and deciding on the amount of the administrative fine in each individual case due regard shall be given to the following:
A) the nature, gravity and duration of the infringement taking into account the nature scope or purpose of the processing concerned as well as the number of data subjects affected and the level of damage suffered by them;
b) the intentional or negligent character of the infringement;
e) any relevant previous infringements by the controller or processor;
i) where measures referred to in Article 58(2) have previously been ordered against the controller or processor concerned with regard to the same subject-matter, compliance with those measures;