This domain is associated with a disposable or temporary email service. Users can create throwaway email addresses that expire after a short period.
The domain quantnetwork.city is powered by generator.email, a known disposable email provider. This means any email address @quantnetwork.city is temporary and will likely become inactive within hours or days.
Users often create addresses on domains like this to sign up for services without using their real email. While convenient for privacy, these addresses are commonly used to abuse free trials, promotions, or bypass verification.