Wordle 1,135 4/6 

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You need to be unplugged for 12 consecutive months for Proton to delete your account because of inactivity though, which seems fair for free tier accounts. A simple login is enough to prevent this, you do not need to send an email or whatever, simply log in once a year. You also get reminders sent to your recovery email before this happens. Data storage for inactive free tier accounts isn't free for Proton.

I believe you're right. However, if memory serves, the ads did change occasionally, meaning the screen had to refresh, leading to increased battery usage.

I just sent them a message asking them to disable the ads on the kindle I had recently purchased, and they did so for free, no root needed. That was a few years ago though, so I doubt they do that anymore...