I have visited some of my sites with the Tor browser and checked Google Analytics(GA4) to track the activity in real-time. but I did not have any data in my G.A panel! Is it reasonable that G.A ignores the data of Tor's users?
It does - it tracks all it can regardless of the way the website was accessed. So - when you're having a website in both Clearnet and Darknet(not just Tor, it's right for I2P and ZeroNET, e.t.c.. either) - you make a server-side filtering to exclude any tracking code. Then it works well in both worlds