Only other way they can get it on the phone is to install it from Marketplace, but its not on Sense UI phones
Swype | Text Input for Screens
HTC's input method is there standard Virtual QWERTY, not using Swpe. (to slide your finger around the keys to get words to type quickly)
Actually, Swype came pre-loaded on the last OTA update for the Evo. (It did not come pre-loaded on the Shift from the same release era, so it's unclear if this was HTC or Sprint's doing.)
Other popular contenders for this type of input are SlideIt and FlexT9, with at least one guy in the Evo forums telling everyone to drop Swype in favor of FlexT9.
Keypurr also has a great reputation.
All worth exploring.
