Keep Your Hands Clean, Stats.app
To display the stats on the menu bar, install MenuMeter instead of some spyware-like system monitoring tools like Stats.app ¹ ² ³ ⁴ instead. Or you can try my fork without the stealthy behavior: https://github.com/jakwings/mac-stats/releases
To see how the developer was lying on this issue (exelban/stats#714), check the code yourself:
This is the historical code related to that issue, but even today the behavior is still the same: https://github.com/exelban/stats/blob/0e2e13c626b650ac7743ef620869d2b7857665cd/Kit/plugins/Server.swift
The --omit start-up flag mentioned by the developer does literally NOTHING to stop your user data (including a custom unique ID, device model, your OS version, OS display language and of course your IP address-es) being encoded in JSON format and then sent directly to their server (https://api.serhiy.io). The flag --omit was just added to trick you into thinking the data was/is really necessary (for vanity download stats?) and should be collected at each launch despite no app update and no way to know when you're going to relauch the app.