Credit Karma is free but the CEO appears to be transparent in how they make money (recommending financial products to you based on what they see in your credit profile).
> Through our partnership with Troy Hunt’s “Have I Been Pwned,” your email address will be scanned against a database that serves as a library of data breaches. We’ll let you know if your email address and/or personal info was involved in a publicly known past data breach.
https://blog.mozilla.org/blog/2018/09/25/introducing-firefox...
How does Firefox Monitor know I was involved in these breaches?
Firefox Monitor gets its data breach information from a publicly searchable source, Have I Been Pwned. If you don’t want your email address to show up in this database, visit the opt-out page.
[0] https://support.mozilla.org/en-US/kb/firefox-monitor-faq#w_h...