I’ve been registered under the DPA since November 2000 and frankly I think it’s great that the law is being tightened up at last. Invasion of privacy is a big issue.
From my (limited) understanding of GDPR, the main differences are that (a) contact details etc on any mailing list and/or record system (whether computerised or not) can only be on it with the express consent (opt-in) of the person/organisation concerned - ie, details cannot be added by implication; (b) anyone has the right to request what data/information is held and for the information to be provided free of charge and within 1 month) - currently there is a fee of £10; © the information can only be held for the purpose stated at the onset; also for duration of that purpose - ie, for example if I enquire about a particular service or product then you cannot put me on a mailing list for any other service or product, unless I’ve agreed to be on that list; (d) and the information has to be stored securely and inaccessible to unauthorised persons.
Where the relationship is contractual, GDPR doesn’t apply to the same extent.
Years ago, I had created from scratch a massive mailing list (approximately 1500 contacts (corporates and high-net worth individuals, massive by my standards) for my newsletter for clients and contacts, but what with the cost of publishing, printing, postage, etc, I ditched it. When I started, it cost me total 50p (£0.50 GBP) for each newsletter, printed 8-16 pages, stapled, bound in a laminated cover and distributed 4 times a year, by the time I stopped the postage alone was 50p. I considered distributing by email but that wouldn’t have reduced the cost of publishing and initial printing (via pdf) and the time and effort in maintaining and growing the list; also it would’ve suffered the same disadvantages as a printed version in not necessarily being kept for future reference by the recipient. Nowadays, I put my newsletter on my website and since the site doesn’t require any registration, log-in, etc., anyone can read it - also, the potential readership is not limited by my prejudices! On balance, I reckon I get as much new business from each newsletter as before but with the added benefit of effectively nil cost and permanency. As a way of keeping in touch with existing clients/customers and attracting new customers, personally I don’t think one can beat an effective website. (Thank you Rapidweaver)
Every day I receive newsletters via RNS from my chosen sources. Every so often, whenever I buy something or simply from visiting a site, I am asked if I’d like to sign up for a newsletter: the process is in my view old-fashioned, I provide my email, I receive a confirmation link to activate. In some cases, particularly when the mailing list is administered by an intermediary I am told that my email address is not compliant! I often wonder how many businesses lose out thanks to their mailing list companies. Whether I actually receive any newsletters depends upon how progressive the particular business/organisation. USA businesses tend to be more active on that score, but their marketing style is often very formulaic and manipulative. Sign up for this and that, buy this and that, and suddenly you’re hooked into a seemingly never-ending round of paying out for this and that. Depending upon how relevant to my needs and aspirations affects how long before I unsubscribe. It seems to me that collecting email addresses for the sake of it is pointless.
I don’t think I’ve answer your question, except to suggest why bother collecting personal data/information for the sake of it when the website itself used to its full potential is ample.
ps - As a rule, I avoid signing up for newsletters where the website mentions sign in with Facebook, Google, Twitter, etc. Also, before shutting down my computer, tablet, phone, etc I clear all (unwanted) cookies, delete all local storage files and any databases.