Wow cool idea! One question, How are you tracking the unique visitors?
TLDR; Each IP is counted as a unique visitor.
To account for multiple devices from the same IP, if same IP visits two days in a row, two unique visitors are counted.
For privacy reasons, IP is not stored, but the sha256 hash of the IP is, so I can not easily track users.
Doing analytics always needs SOME kind of tracking, you'll see that it is not a problem, it is FAR better than letting Google track you using AdSense, that you can agree to.
Besides, everything is deleted after 7 days. Do yourself a favor and lower your cortisol levels, your body will thank you when you get older
I'm not sure how many users use private relays, but I guess it is not too many to severely skew the statistics.
You can easily precompute the SHA256 hashes of all IP addresses and do a simple JOIN to get the original IPs.
I am concerned for you OP.