Facebook opens Ads Page instead of regular homepage after login

My cousin who is a regular Facebook user has a problem with his Facebook account. I think he made something wrong which he does not remember and now he can't log in to his Facebook account properly.

Giant Bing Search Box Appears On Facebook's Logout Page

The Most Comprehensive Guide to Facebook Remarketing [+ Examples]

How to Advertise on Facebook: A Quick-start Guide for Beginners

2023 Facebook Ad Size & Specs – Because Size Matters

The Facebook Ad Algorithm - Need to Know Changes in 2020

3 Best Facebook Ads Alternatives in 2021— RichAds Blog

With ad blocking on the rise, publishers eye a new approach

How To Test Facebook Dynamic Creative Ad Performance - Going Social

How to implement single sign-on with Facebook - Tutorials

Powerful Ways to Use Facebook Lead Ads + Mautic Integrations

How To Fix Non-Functional Landing Pages [Facebook Ad Policy] - FB