Dude...Sorry if it sounds a little bit rude, but use your brain! It's not like like you're installing a unity game bought on steam, all unity games you download here are pirated "portable" versions. You don't install them, you just execute the exe file.
It still calls home tho, there's always (or at least since forever) been a builtin component for that, but some devs added additional crap like red shell and the likes. And it's linked with online id of your pc, so maybe it can be counted as an install. That would be funny as hell.
On that note, it's probably safe to add this to the hosts file
Code:
127.0.0.1 cdp.cloud.unity3d.com
127.0.0.1 config.uca.cloud.unity3d.com
127.0.0.1 perf-events.cloud.unity3d.com
127.0.0.1 prd-lender.cdp.internal.unity3d.com
127.0.0.1 thind-gke-usc.prd.data.corp.unity3d.com
127.0.0.1 thind-prd-knob.data.ie.unity3d.com
127.0.0.1 remote-config-proxy-prd.uca.cloud.unity3d.com
127.0.0.1 data-optout-service.uca.cloud.unity3d.com
127.0.0.1 redshell.io
127.0.0.1 api.redshell.io
127.0.0.1 treasuredata.com
127.0.0.1 api.treasuredata.com
There is also shit like amazon telemetry, so it's probably better to use something like tinywall (I think it's dead now, but was perfect) to block such questionable behaviors for every app.