> I can't think of any other case pre-smartphone, where I'd be denied the ability to buy a product simply because I didn't want to have to buy another totally unrelated product as a condition.

Then you must not have been around pre-smartphone? Those of us who were will remember having to buy either banknotes or checks. Later, some would accept a certain type of card that you could buy. If you weren't willing to buy any of those things there was little chance of a deal taking place. Showing up with your goat to offer in exchange would get you laughed out of the room, even though there was an even earlier time where bringing a goat would have been considered quite reasonable. Realistically, the most desperate vendors will still accept your goat as payment if that is what's on the table, but, as I am sure you can imagine, it isn't worth the effort for those who have the luxury of choice. Where technology makes a seller's life simpler, they will demand it. Why wouldn't they?

None of this is comparable lock-in. You could buy checks from hundreds of different vendors and none had any lock-in on you. You could use a different vendor each time if you wanted. By certain type of card I assume credit cards, which can also be had from thousands of different banks.

Also, credit cards are free to get and checks cost a few pennies.

Not remotely comparable to being forced to buy a phone to get to a game.