Pay per GB
Pay for EXACTLY the storage that you used in a month, instead of having to bump plans with *** GB increments - and serious price increases.
Proton uses limits to extract maximum consumer surplus and force new plans on people, when all they want is just more storage. This is just like commercial companies, and leaves a bad taste.
The better approach is to align consumer value and producer cost : pay for what you use, with a standard cost-plus premium. It's not how you make the most money, agreed - but it is how you build a loyal user base.
This can the max usage hit per month, but it would be nicer if it was calculated per day, invoiced per month. With post-pay you never have to worry about running out of storage. Another option would be standard (smaller) increments, reserved up front (pre-pay).

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Danial Mehdi commented
I stopped paying when you guys started implementing in GitHub my proton got destroyed so why should I pay when you guys make it worse
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Danial Mehdi commented
Without knowing don't bark so u can implement more and ****** everything for me right with my own money
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Danial Mehdi commented
I already paid for year dude are out of you mind in euro
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Danial Mehdi commented
I knew this class was made for me to make me a better person but in the middle money made them blind and a good gome bad and a bad gone worse and you know that
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Danial Mehdi commented
Leaking is right thing or saving someone is a right thing let's decide
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Danial Mehdi commented
So proton can earn through me as well I'll give em ideas and much more interesting things I'll pay for every single thing
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Danial Mehdi commented
Yeah my money my credit card and enjoy once again stealing is all you guys no I'm not greedy o don't have greed lang better knows me I don't have greed that's why I didn't show anything yet but just showed what I am capable of and nore I'm gonna show what can I do further you guys lied cause leaking my data is your purpose and my purpose was to give you that thing your craving so your work don't stop so called class
Thank me later for that i54k$ a day where gonna spend that -
Kazimierz Krauze commented
I agree, but remember that Proton itself is a company and they also need pay their workers.
And I think when people will pay for only what they use Proton would accually earn more mony.