Lobbyists demanded it. Kentucky passed something similar earlier this year [0] - banning TikTok from state computer networks. An amendment exempted universities from the ban, but libraries are still blocked. It was signed by the governor on March 23 and went into effect that day[1].

0 - https://apps.legislature.ky.gov/record/23rs/sb20.html

1 - normally, state laws go into effect at the end of the year or end of legislative session (depending on the state constitution) unless there is an "emergency" in which case it goes into effect the day it becomes law.