The eSIM may not "lock" it into ATT, but I'm betting the device programming does. When you buy a new iPhone directly from Apple, you can either choose to have it programmed to a carrier or buy one unlocked. If it's unlocked, you do the leg work to get it set up with your carrier vs having it come from the factory pre-programmed to work with that carrier's network. They won't put a different eSIM in the phone...the eSIM standardized things for the cellular industry and made things more simple for device manufacturers (and technically, in the old days, CDMA phones didn't even use SIMs...SIMs were only used on GSM networks).
To continue the iPhone example....you could buy a phone from Apple and say you want it for ATT, then eventually terminate your contract and satisfy all your obligations with ATT and make a request to have then unlock your phone, which means it can then be used on another carrier's network. My guess is that wi-fi hotspot would have to be unlocked (or jailbroken) to be used with another carrier. That would require either Jeep, Sirius XM Guardian, or whomever the subscription is through to give you the information needed to unlock the device.
I'd be willing to be a month of alimony that's not happening