Pro is speaking 100% facts. While CreatorPrograms from companies like UbiSoft and CapcomUSA are a great way to get keys, sites like Keymailer and Rainmaker are all great sites to get keys if you're a Gaming Creator on a budget.
This includes both AAA and indie titles. We don't gate-keep, because at the end of the day this will just lead to more people marketing indie content.
Gaming Creators use these sites to get games from Devs