The "scores" are only loosely related to actual credit ratings, which are somewhat context/application dependent.
In reality the sites are mostly just marketing fronts for various consumer services - credit cards, loans, mobile and energy contracts, and so on.
They're notoriously aggressive about getting you to log in and keep checking your score. Partly because this looks good for partner engagement metrics, but also because it trains you to keep checking your score in an obsessive and gamified way.
