"Have got loads of email about GDPR asking me to sign up for continued junk email."
How about a company using GDPR as an excuse to send marketing crap?
Since the start of May, a supplier to one of my clients has been sending emails to my address for that client (at their domain). So far, five emails.
The first two were ostensibly requests for me to opt in to receive future emails because GDPR - but they were really marketing emails using that as an excuse. The last three reverses that: They were quite openly marketing emails, with a section asking me to opt in because GDPR.
Prior to May, I wasn't receiving any such emails from that supplier.
And thankfully, I should receive no more.