To understand the problematic of the players, I think that it is important to know that on the corporate world, having a piece of software approved for installation can take many weeks (and sometimes even months), eventually being denied at the end.
For reasons that I think are obvious, in this same environment, making the notebook available through cloud service is also a no go, as content is typically IP sensible, and the public cloud is not an approved sharing point (I mean, if the CDF player is not listed on the company tools, why would the public cloud be...).
So, either Wolfram technologies are well integrated on the working environment of a given company, and all these tools are pre-approved, or even eventually already installed (a very small chance... as I myself, for instance, have never encountered such a case....), or there’s a great chance that the pdf will be the only option for sharing.