[mmackh]

Both Ultralight EV1 and NTag 21X are supported and recommended. Cloning is possible for the NTag, but there’s currently no chip out there that can actually lock block 0, which makes detecting and bricking them trivial.

One can make this system as secure as the specs require it to be: brick clones, reject certain tag types, add encryption, add counters, perform analysis server side, etc.

[xaduha]

As long as people are warned it's up to them to decide. Personally I like standards and this on the other hand is a bit of a lipstick on a pig situation. It was allowed to go on for far too long already with every vendor just glossing it over, not unlike what happens with actual locks and keys.