It's obvious to any non native english speaker, when you have a spam in english, it is because they toke the email from the web. When it's in you native language, it's usually from a data breach.
I'm vastly more spammed by the later. I can confirm it with unique email addresses of the "+" form (but not with the + character).
Also when I'm spammed in english, it's for Web3 crypto stuff and from a data breach it's a phishing attempt.