Re: "opt-out was probably the best choice"
you need to read up on GDPR.
Nothing collected by Canonical is GDPR infringing. It's basic hardware metrics on a machine similar (but more techy) to the advertising blurb you see on Dells website giving ram and cpu specs etc. A machines info inst covered under GDPR or DPA.
Your helping to pour fuel on a heated debate by having no idea what your actually talking about. Stop it its silly.