Opt outs should be banned
All such systems should work on the basis on opt in.
In order to opt out I must know what exists.
I must make contact with the company, often with whom I have no wish to do business
I must provide them with valuable personal data
I must trust them them treat my data with due respect
It raises questions as to why I have chosen to opt out.
Only a scheme were people wishing to participate have to provide their own consent in an informed way are acceptable.