Uhu, exactly. I get that it’s frustrating, but the simple fact of the matter is that offering unlimited storage capacity (or unlimited anything for that matter) will inevitably attract people who will abuse it. Their new plans are functionally unlimited for most people, while also curbing that abuse.
That’s not to praise Dropbox too much (they shouldn’t have offered unlimited in the first place, but it’s an easy way to draw people in), but I still can’t fault them too much for how they handled this.