I do believe that all this account was created by the same person and with the same password. Why:
- this is testnet and this is top of the harvesters. Who else need maintain testnet except founders/developers?
- As I understand password is used somehow in the process of private key and then address generation.
So am I right? And do you believe that this is ok to have such strong dependencies that could be recognised even visually? (I’m not sure how to use this knowledge yet, but I’m trying to)