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Earlier this year, I started getting weird emails from Netflix. They're weird because I'm already an active Netflix subscriber, but the emails are for inviting me to join Netflix.
When I took a closer look, I noticed that the email was for username+500px@gmail.com
Screenshot: https://i.imgur.com/wG0IhUK.png
I only ever use that email for registering with 500px. I'm also aware that 500px experienced a data breach on 2018.
So I'm highly suspicious that Netflix is using emails info from other websites' data breach for marketing purposes (knowingly or not).
This is very worrying, IMO.