people will weaponize it and start teleporting chemicals into the heads of the heads of state and the economic competitors. i remember watching the show Jupiter legacy, there one guy had a teleport stick, it could teleport him or itself whenever he wished. So when big guy threatens him and sent goons to him, he just teleported the stick inside the big guy's heart
people would abuse physical laws to create perpetual engine machines like the water teleporting from the bottom of the ocean to the top of the mountain and then powering the machines as it runs down
or even something stupider, like teleporting plasma from the core of the sun into the lab
people would teleport out through the solar system and galaxy, bringing humans everywhere where there is a solid ground on other planets and moons and running from other humans who have teleportation power
people would steal shit from each other, like no bank would ever be secure, no leader ever secure because someone could kidnap his wealth, family, by teleporting into his safe space, or teleport a bomb into the most secure bunker