First, I'm a newbie here, started studying crypto stuff less than a week ago.
Got interested in it after finding Privatix.io, which uses a blockchain platform for P2P network sharing of unused bandwidth.  Sounds like a Magnificent project.
Took me too many hours just to put a few USDollars into an account; first bought some ETH at Coinbase, and then moved them to MyEtherWallet.  Each transaction charged a small fee.
Now, I cannot find how to trade those ETH for the Privatix PRIX coins.
How to do that?  Cannot find an Exchange that deals with PRIX.

OR,...  maybe I shouldn't choose Privatix?  In this week, I've found a few other websites that allegedly do about the same thing, like substratum.net and mysterium.network and orchid.com.
Anybody here has studied those four companies/websites?  I'm not specifically interested in the INVESTMENT side of this; moreso in USING the service. 
WHERE can I find info comparing these projects?
Pros and cons of each service?
Do you know of other websites that offer a similar thing?

Any advice?  Thanks, people.
Mark226