On 25th May 2018 the law about data protection changes significantly. From that date, I can only retain your contact details if I have demonstrable permission from you.
If you don't do anything, I am required to delete your contact details, and you won't received updates.
I keep your contact details on my laptop, in my iCloud account, and on an external hard drive. I do not share you details with anyone else.
In order to contact everyone via email I use Mail Chimp. This is a third party who enable sending out large numbers of emails. Your name and email address is stored with them, but they are also dedicated to keep your details private. If you want to unsubscribe, then when you click on the button at the bottom of the email, then you will be unsubscribed. It's not a scam to see if you're still there.
In the light of the recent debate about data protection, there will no longer be any third-party controlled adverts on this site.