Thank you for reaching out to us first and for the intention to spread Cryptomator. The idea sounds basically plausible and good but unfortunately no approval, that has a few reasons:
Security: I’m not implying that, but in general a modified app that doesn’t come from our hands can be an unpredictable security problem for the user and can fall back on us if misused (e.g. negative press etc).
Sustainability: It costs money to develop Cryptomator. We are involved in development full-time and would love to continue doing so. For this, we still need, among other things, the income from the Android app so we can pay our salaries and don’t have to work for something else on the side.
Fairness: Other Cryptomator users have purchased the Android app. It would not be very fair to them if we allowed a free variant.
For each category there would be a few more points to mention, also there are more categories but I didn’t want to make this post too long but still provide some justifications.
I hope you can understand this, thank you again for contacting us and thank you for your goals to spread the word about Cryptomator.
Maybe a translation into an appropriate language would be a possibility to spread Cryptomator in some countries. If you are interested, here is the link to Crowdin, where we manage the different languages and where you can easily add a new one. With the next release the app would be available in the appropriate language.
Happy to hear from you.