When we met with our Rep, he showed us the internal alteryx app (always a good sign that Alteryx uses its own technology for data analytics) for our account. Essentially, if you have your data sharing options turned on, then they can see tool use counts and the number of times a user has pressed the run button. We were reassured that actual data isn't transmitted. Someone from Alteryx like @LeahK can join the conversation and reassure you, but we're satisfied that our PII never leaves our network.
That said, when I installed Alteryx on all of our virtual machines, we deployed it with a configuration file that has the usage stats reporting turned off. Force of habit.
