Legitimate free slots exist. Paid ones are either reselling expired links or outright fraud.
Select your app and navigate to the "TestFlight" tab. youtube beta testflight free
Keep checking the official TeamYouTube Twitter feed. The next window of free beta slots might open today. Legitimate free slots exist
Note: As of the current cycle, the link often changes. You must search for the official "YouTube iOS Beta" invite link provided by Google. youtube beta testflight free