Not unusual
Mr O said:
"This CJEU ruling wins European citizens a property right over something (an IP address) that they didn’t create, (the network operator “creates” the address), and which they cannot control.
Roll that one around for a minute."
I didn't (directly) create my date of birth and have no control over it but it's potentially identifying data (puts me in a small subset of UK folk & pretty much 100 % guaranteed to ID me with just about any other bit of data about me to remove other potential matches)
On the more mundane "randon number" level (much like an IP) - nor did I create my NHS number, NI number, EHIC number, passport number, driving licence number, landline phone number etc. (or have very much control over them)
Plenty of identifiers we do not create / control, but like those above do not particularly want storing unless absolutely necessary (hence why most people give "non essential" web sites that store DOB a fake DOB )