Good idea if portal for ArcGIS support CAPTCHA before login to avoid and prevent robotic login using someone account and block it by 5 times miss attempts
Not captcha, but if you're using token accounts (rather than SAML2), then you can enable MFA which is arguably better than captcha.
https://enterprise.arcgis.com/en/portal/latest/administer/windows/configure-security.htm#MULTIFACTOR
A strict password policy can also reduce the login attempts and make it hard for robots to get in: https://enterprise.arcgis.com/en/portal/latest/administer/windows/configure-security.htm#ESRI_SECTIO...
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