Not just that, but they go as far as claiming that single-use Solo cups are more environmentally than using a mug. Literally anything made cheap and quick and with little energy is better by their calculus. Doesn't pass the sniff test, IMO.
As opposed to ceramic mugs that just materialize in your house? Not sure about you, but I don't have a dilithium powered transporter in my kitchen.
And then there's thrift store mugs - sure they were almost certainly trucked to _somewhere_ a long time ago.