Yes.
I see in front page
Traccar icon in browser tab.
Do I can remove it or change it?
Also down in the web page right this line :
Powered by https://www.traccar.org
Do I can remove it or change it?
Yes.
How can I change the logo being displayed on the tab with the title ?
Just replace the favicon file.
Do can run Traccar sever for commercial used?