You can disable the recording of login sessions in Protonmail's settings dashboard. I do that, not only to avoid Protonmail learning of the logs, but by a hacker who, once upon breaching your account; also gets to learn the IP you use to login with.
Thanks, I had "Basic" on and turned it completely off. This should be Disabled by default. I created a new account to see what the default is (it's Basic): https://news.ycombinator.com/item?id=28428092
