Just make it so the batteries are easily replaceable. It's wasteful to buy a brand new phone when all you need is a new battery.
Also doesn't change the upstream clarification that you don't need to buy a new device to get a new battery.
The point of this predatory pricing tactic is to force owners of phones with sub-$200 in value to upgrade, rather than potentially waste half (or more) of the phone's value on replacing the battery.
The Moto G is usually cited as one of the best mid range phone and it doesn’t have user replaceable batteries. I don’t think most of the cheap Walmart phones have user replaceable batteries.
Auto’s were not built for ease of repair, the repairs themselves can be quite easy if you know what to do, and often require components that are only 1 or 2 orders of magnitude in price. Paying someone who knows what to do with it, they also add an order (similar to screen repairs).