I don't do much legacy brick and mortar CC shopping anymore, but it seems completely random at Home Depot and Target if they want my signature or not. Maybe af

I don't do much legacy brick and mortar CC shopping anymore, but it seems completely random at Home Depot and Target if they want my signature or not. Maybe after X transactions in the last Y days they no longer need a sig. With a possible side dish of Z percent or lower of transactions are fraudulent from this store.