Roommate spying on internet use through Raspberry Pi

Looking for a bit of help. My roommate set up a raspberry pi zero on our router claiming that he built an ad blocker. That much is true, but he slipped up last night and mentioned how he can use it to monitor internet use and browsing. My question is how can I block that on my end from my computer? Thanks in advance, apologies if this is in the wrong place.

Submitted March 31, 2018 at 09:46PM by RichAnteater89 https://ift.tt/2H4AnJL