Everything tech1966 said.
This is a really pessimistic interpretation of early access. It's true that you're doing beta testing for Crytek, but your responsibilities are different. In professional beta testing, the developers crack the whip on you and force you to look for specific things and replay specific parts of the game over and over again. I've never beta tested professionally, but I understand that it's a dreadful process for the testers.
In the case of early access you pay to play the game in it's pre-release state. That sounds a lot like beta testing, but as a player your purpose is just to have fun. You mentioned PUBG as an example. In the case of that game, it was a buggy mess that early access players had to wade through. But you also mentioned "millions of players play testing it". How did PUBG Corporation trick millions of people into willingly beta testing their buggy, incomplete game? They did it by making the game a ton of fun.
Hunt: Showdown promises to offer the same experience. The article claims that Crytek plans to spend 12 months in early access. That means you don't have to buy into it right away. Keep an ear to the ground for reviews on YouTube or game sites. If it sounds like something that could be neat, then you can purchase the early access right now for $30. The game is slated to launch next year at a higher price so you can pay the lower price now and save yourself money in the future if you really enjoyed it.
1. Professionally beta testing sucks. This is different.
2. A game can be buggy and still be a fantastic experience like PUBG (also look at year 1 of World of Warcraft).
3. You pay a low risk, reduced price for Hunt: Showdown. There's less buyer's remorse if you end up not liking the game.