It's indeed a problem, but unfortunately not one we can control. The price is only going up for around 3 dollars and its equivalent in local currencies, and the battle pass is fully and only cosmetic. Buying one and completing it will provide enough currency to buy the next one (thus creating a cycle of endless free battle passes for people who play a lot). It's meant to cover server costs and ensure a long life for Temtem. Many of the reviews haven't looked into any of this, and there's people who are automatically opposed to any sort of battle pass, which is very unfortunate because the pass won't affect the rest of Temtem's quality and good features.
It'd be great if those who have played and liked it leave a good review, and we'll do our best to make the goodness of Temtem known so people want to give it a chance.