Thanks for bringing up your concern about dehumidifier functions in mainboards and corrosion!
First of all, let me give a quick overview of what the dehumidifier function on a PC mainboard does. It’s a fairly rare function, but it will sometimes be found on very high-end, business and workstation boards. In essence, if the computer is left in sleep or hibernate mode, it will every now and then ramp up the case fans to circulate fresh air through the case. This can help avoid corrosion due to humidity in the long run.
As it requires case fans to circulate the air, it’s not something we can do with the V. After all, we’re completely fanless!
Though I do not have the environmental operating ranges of the V at hand, using any kind of electronics in a high-humidity environment is bad for its longevity. I’d say that how susceptible other fanless electronics you use are to corrosion in your operating environment, is a pretty good indication of how much of an issue it will be for the V. For most people, it will be negligible.
Then to corrosion. iPhones, iPads, MacBooks and pretty much all computer hardware, Apple or otherwise, do not like moisture. As such, Apple does not cover liquid damage under warranty. Neither does Eve. Using or storing electronics in very humid areas allows liquid inside the device, which can lead to corrosion.
@AML’s example of the soda spill is an example of that. Apparently there was no direct short-circuit that caused damage when the liquid was initially spilled, but over time corrosion messed up a component or circuit somewhere. Liquid is either a very fast, or very slow killer of electronics…
So to answer your questions about risks of humidity and corrosion? For the Eve V, these risks are the same as for any other modern consumer electronics. I hope that helps settle your concerns!