Proton
Empowering you to choose a better internet where privacy is the default. Protect yourself online with Proton Mail, Proton VPN, Proton Calendar, Proton Drive. Proton Pass and SimpleLogin.
Proton Mail is the world's largest secure email provider. Swiss, end-to-end encrypted, private, and free.
Proton VPN is the world’s only open-source, publicly audited, unlimited and free VPN. Swiss-based, no-ads, and no-logs.
Proton Calendar is the world's first end-to-end encrypted calendar that allows you to keep your life private.
Proton Drive is a free end-to-end encrypted cloud storage that allows you to securely backup and share your files. It's open source, publicly audited, and Swiss-based.
Proton Pass Proton Pass is a free and open-source password manager which brings a higher level of security with rigorous end-to-end encryption of all data (including usernames, URLs, notes, and more) and email alias support.
SimpleLogin lets you send and receive emails anonymously via easily-generated unique email aliases.
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Just use encryption like Cryptomator, before sending data to the cloud (so also Dropbox) and you are safe.
I use encryption for my backups but so far it's proven too inconvenient for the actual files
Why? Just store your files locally in the encrypted vault, which will be synced with Dropbox. And you could even use MountainDuck for the communication between Dropbox and your computer, so you don’t need the Dropbox software (and all the tracking/analytics) at all.
(I use onedrive but same principle applies)
Mainly just that, there's no way to access files except thought the vault software. Other apps, third or first party, can't use them. I can't see them online or use any web documents/shared documents. It basically turns cloud storage into a syncing app, but I can just use syncthing for that.