I don't buy this. The whole point of the GDPR is to protect consumers from companies processing their data. If the dark-mode toggle data is only ever used local

I don't buy this. The whole point of the GDPR is to protect consumers from companies processing their data. If the dark-mode toggle data is only ever used locally, then the data is never "processed" by the company. At most this is a bad transcription of GDPR into German law.