ProtonMail now has a beta of their secure cloud storage, proton drive. I got early access as a subscriber and can say it looks promising.
I wish I had the convenience of a desktop sync app, but I’ll take what I can get for now. No more indexing of my data.
@gritnot Oh perfect thank you. I can see a situation where it would be really expensive for them to have more space for everyone on the drive, even if it's a paid-only feature. I do think that they're angle of using it specifically for a smaller set of highly sensitive files makes good sense.