They should have taken the same approach with their pickup. People expect trucks to be able to haul, tow and have a certain amount of bed space. If they were serious about building a pickup, they'd build something like the Lightning—a truck that could do all of that, but happens to be electric. Heck, if they did that Rivian might not be in business.
The Cybertruck is a novelty item and nobody who wants or needs the utility of a truck is going to consider it over a Rivian or F-150 Lightning.