I just looked at how much it would cost to claim a reward from a smart contract I have money invested in. I would claim $16 and transferring it to my wallet would cost $169. I don't see how this is affordable.
The article is about El Salvador's switch to Bitcoin, so the price of smart contracts in Etherium, or some other system, is beside the point.
[0] According to <https://bitcoiner.live/?confidence=0.9> at 6:31 PM CDT.