Free Trial Abuse Is Quietly Killing Early SaaS Revenue (Most MVP's Aren't Built to Stop It)

Free trial abuse is a common issue where users sign up multiple times with different email addresses, affecting revenue. This problem is often invisible in healthy-looking metrics. To fix it, identify repeat users through device and browser-level signals, not just email or IP blocking. This is an architecture problem, not a growth issue. Founders should focus on authenticating users, not just blocking fake ones.