Really makes me appreciate that unsolicited emails are illegal in some European countries like Germany
Otherwise I don't think you can argue any legitimate interest.
https://www.ris.bka.gv.at/NormDokument.wxe?Abfrage=Bundesnor...
Edit:clarified never
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
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...