> Erasing everything I ever wrote down about you is difficult.

It is not difficult to avoid storing data you don't need.

You don't need a user phone number? Easy, don't ask for it.

Of course you argument is that it is difficult to change existing systems to follow this principle. Except that your starting position was that this regulation was about stifling competition, which is thus in direct contradition with this argument.

Existing systems were built on the assumption that "misappropriating" PII was a lucrative thing to do. This led to abuse from the industry.