Really makes me appreciate that unsolicited emails are illegal in some European countries like Germany
It boils down to a risk/reward trade-off, but I doubt that someone would as easily send thousands of spam mails, and also publicly boast about it
Otherwise I don't think you can argue any legitimate interest.
https://www.ris.bka.gv.at/NormDokument.wxe?Abfrage=Bundesnor...
Edit:clarified never
In reality it’s very easy to end up subscribing to newsletters and even my European embassy subscribed me to their event newsletter in Thailand—of course I never agreed to any of that.
It seems that with the gpdr this is now eu wide:
The law for that, at least in my country, is very clear: https://www.ris.bka.gv.at/NormDokument.wxe?Abfrage=Bundesnor...