the knock on them is exactly that, 20 years later they're just a file storage saas. the idea was they must be able to expand the surface area over time
but it doesn't match the archetype of a "growth" company. to the commenters talking about the share price, if you want a consistently growing stock, that's not the way to do it (not saying it's right or wrong)
They do one thing great apparently. I know many people that cannot be convinced to switch away from Dropbox.