The main issue here is that, much like 4000w HID headlights, they only irritate others, not the owner/purchaser of the vehicle, who may not even be aware of what their rear turn indicators look like, or that there is anything wrong with them.
Or like the dashes that light at night even when your headlights aren’t but your DRLs are, so you are completely unaware you have no taillights and it’s very difficult to discover otherwise.