ImportFromWeb doesn’t have the ability to login to a website.
However, users with technical skills may be able to use the function to extract data form private pages:
Like ImportJSON, ImportFromWeb accepts a cURL request as first parameter. You might be able to copy the full cURL request from the Chrome Developers tool and use it in your IMPORTFROMWEB function.
Beware that, by signing up to a platform, you may have accepted the platform’s terms and conditions. Check carefully that using a tool like ImportFromWeb