Before cell phones, phones were opportunities. Calls could be anything. Maybe you won something or a politician is cold calling constituents or something. Maybe someone got your number from a friend and is calling for the first time.

Its just very old habits that are hard to kill. Younger folks see random calls as almost certain scams. Text messages or emails with links get deleted immediately. Theres essentially a 0% chance a random call or text is actually beneficial to me.