What you have discovered is one of the disaster areas for the new System Settings. Obviously copied from the iOS Settings without enough care and attention. On macOS this list of background apps is bound to confuse users and raise often unwarranted fears.
Just to clear up a minor confusion. Items in the list are those allowed to run in the background. This list does not indicate that they are running.
Charlie Stigler is likely the developer of an app you have installed. This name appears because it is associated with the digital certificate signing the background app. You will need to use web searches to discover what apps Charlie Stigler has created. My best guess is this Charlie Stigler who has an app called SelfControl.
For 'eudataback' there is (as you have discovered) an information button which locates the background app in Finder. That gives the hint that it is part of the Easus Backup Software.
Very likely all your background apps are legitimate.
But note that they could include apps that you uninstalled in past by just deleting the app in /Applications without discovering and removing associated files and tasks.
Apple will need to do something to cleanup the "Allow in the Background" list so that the parent app is correctly displayed. This may be difficult where the parent app has been deleted but the background tasks have not.
It seems downright sloppy that Apple has not tidied things up their own background tasks. I don't have OSMessageTracer Pathway in my list, but I am pretty sure this is legitimate. Possibly it a remnant from an earlier version of macOS - see Is OSMessageTracing in Startup Login Items Legitimate?
I do have
com.apple.bluetooth.PacketLoggerHelper in my list.
I will end with an example on my Mac showing that it may not be easy to track down all legitimate items. I have a background app labeled as "PhotoMinds LLC". I do know that this is legitimate, but it is not for a photography app, it is for Arq Backup from Haystack Software.