Haven't seen this discussed but may have missed it, found out today that as of Oct 1st 2022, ESTA has been required for entries by land and sea in addition to by air.
Effective October 1, 2022, all Visa Waiver Program (VWP) travelers intending to enter the United States by land will be required to obtain an approved Electronic System for Travel Authorization (ESTA) prior to application for admission at land border ports of entry.
CBP encourages travelers to apply for a travel authorization at least 72 hours in advance of their anticipated arrival at a U.S. land port of entry.
https://help.cbp.gov/s/article/Artic...language=en_US
https://www.cbp.gov/newsroom/nationa...gram-travelers