[Propelloni]

You wouldn't but nowadays no bike is unmarked, even the cheap ones.

[0cf8612b2e1e]

Can’t you trivially deface an identifier?

[NicoJuicy]

In Belgium, it's a hard to remove sticker on a consistent place with a qr code.

It would take work to remove it cleanly and/or cost money/time to paint over it.

So it's less attractive.

Ps. You'll still need to take care of your 10 k. Bike ofc.

Ps. 2 : engraving isn't done anymore since bike frames got smaller.