[SmellTheGlove]

Probably more detail than I can really articulate, but I've lately perceived a shift in how Microsoft wants to support legacy and maybe getting more aggressive in taking a stance in eliminating some.

Right now Microsoft seems really high on cloud, particularly as a means to make Office a subscription product (which helps with legacy support, as in the long run, there are no legacy versions to support in this model). From that respect, I don't think OneDrive is at any risk of ceasing to be a product, but I do think they might yo-yo the storage quotas and things like that. Didn't they do that with SkyDrive a while back?

I'd certainly rate their risk lower than Google, which does have a history of abandoning things that people really like.

Dropbox and Apple are lowest risk for me, but for two different reasons. For Dropbox, it is their product, and they seem to make money. For Apple, it's baked into their user experience, and they tend to focus on that - rather than cut costs and compete on price, they'll make it more expensive if they need to, but it'll probably continue to work well.

[mynameisvlad]

You are right, your quota will depend on when you got the account and what you did. At various times, we had 5, 7, 15, and 25GB for free. When the big nerf happened from 25 to 7 (I think that's the one you're talking about), existing accounts could opt in to 25GB (personally, was not a fan that it was opt-in) for life. Same thing happened to the O365 offering, nerfed from unlimited to 1TB which is more reasonable, I don't know why anyone would offer unlimited storage honestly, that's just an open call for abuse.

Edit: For me, after Apple actually decided to integrate iCloud into macOS, I felt more secure about it staying, but before that it definitely felt like a pet project that might be abandoned. I still don't fully trust it with my documents, but since I have an iPhone, I have well over 15GB of photos and videos uploaded that I'd like to see stay for a while. :)