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New Tuta Calendar app is now on F-Droid
(tuta.com)
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Its a similar problem with Proton for me. Proton doesn't even let you sync to 3rd party cal app on the free tier.
If you're going to paywall basic functionality, that just prevents me from trying it for a while and eventually become so tied to it, it's difficult to break free. Google had the right plan from the get-go.