Don't know, I didn't try to break down the data being transferred. More likely than not internet, so yes, I assume they could change this to third party ads in the future. Or even if it's local, a update could change that. It's a sidebar you can fully close, so it's not annoying in any way...for now at least.

You can read a detailed breakdown here

https://medium.com/@chribonn/howto-use-of-msp360s-formerly-c...