Wow, I never knew about that and it's not just a small fee either. This 2020 article has it at 9,500 Euro/10,300 USD. "Some observers worry Nature's €9500 publishing fee is so high that it threatens to divide authors into two tiers—those at wealthy institutions or with access to funds to pay, and everyone else."
It's already hard enough getting funding in some fields of science without that kind of added expense to put your data out there. Definitely sounds like you're right to call them out.