Who is not eligible for Visa Waiver Program?

Visa-free travel does not include those who plan to study, work or remain in the United States for more than 90 days; are not ineligible to receive a visa under U.S. visa law.

https://uk.usembassy.gov/visas/visa-waiver-program/non-immigrant-visa-waiver-program-vwp/#:~:text=Visa%2Dfree%20travel%20does%20not,visa%20under%20U.S.%20visa%20law.