Let's be honest Helldivers 2 is a really good PvE game with AFAIK only cosmetics via microtransactions. It's not some addictive MMORPG to earn money from whales.
Whole issue here is not about game at all, but about Sony being player hostile company and just plain breaking some customer protection laws.
Micro transactions allow easier unlocking of functional upgrades via "warbonds" that you buy eith premium currency "Super Credits". This currency is easily available in game and I have unlocked all the warbonds without any micro transactions. Even if you do buy the warbonds, you still need to play the game to earn "medals" to unlock the items within the warbond.
All in all, it is a pretty reasonable and non-exploitative monetization and is about the limit for what I would tolerate in a game I already paid for.
Whole issue here is not about game at all, but about Sony being player hostile company and just plain breaking some customer protection laws.