Trying once again to put this thread to rest.
I will assume the mysterious Google files being referenced are the same as the Google files referenced in this three threads I posted above. If this assumption is true, and it probably is, I can provide some better answers.
harenet wrote:
What is Google LLC login item?
There is no Google LLC login item. This is a side effect of Apple's awful new System Settings user interface. If these items aren't constructed "just so", then Apple will just dump the name listed in the software's digital signature, instead of the name of the app and a pretty icon. In the example above, Apple was happy with "Google Updater" for some reason. But it was not as happy with "mystery item".
But it looks like "Google LLC" is actually:
[Loaded] com.google.keystone.daemon.plist (Google LLC - installed 2022-10-27)
Executable: /Library/Google/GoogleSoftwareUpdate/GoogleSoftwareUpdate.bundle/Contents/MacOS/GoogleSoftwareUpdateDaemon
whereas "Google Updater" is:
[Loaded] com.google.keystone.agent.plist (Google LLC - installed 2022-10-27)
Command: /Library/Google/GoogleSoftwareUpdate/GoogleSoftwareUpdate.bundle/Contents/Resources/GoogleSoftwareUpdateAgent.app/Contents/MacOS/GoogleSoftwareUpdateAgent -runMode ifneeded
[Loaded] com.google.keystone.xpcservice.plist (Google LLC - installed 2022-10-27)
Command: /Library/Google/GoogleSoftwareUpdate/GoogleSoftwareUpdate.bundle/Contents/Resources/GoogleSoftwareUpdateAgent.app/Contents/MacOS/GoogleSoftwareUpdateAgent -runMode xpchost
Those with a keen eye might notice that these are actually the same file. Really sharp-eyed people might notice that I've only listed 3 files whereas the OP's screenshot seems to indicate 4 files. There's a good explanation for that. I'm just randomly pulling data from someone else's question. People are demanding answers! And the fact that it is physically impossible for us to provide accurate answers isn't good enough. Therefore, here are some wrong answers. Happy?
What is it doing?
Not a clue in the world. Probably something related to Google software update. If not that, then something else.
How is it functionally different form Google Updater?
Apparently, it's the same freaking file. Is that functionally different?
Why is it able to install itself in my log in items without any authentication or opt-in action on my part?
Because at some point in the past, you gave Google full control over your computer and all of your data. Depending on how your computer and the rest of your devices and services are configured, Google could have effective control over all of your devices and all of your data on any cloud service in any cloud service.
How did this happen? Google asked for an administrator password and you provided it. Did you know that this is true of any software developer when you provide your administrator password? Is that scary? It should be.
Can you trust Google with all of that power and that data? It depends. Obviously you do, so that's a moot point. But in truth, Google really doesn't care about your data. They are happy to sell your personal information regardless of what is in it. The details don't matter. What matters is control over and ownership of the data. It all belongs to Google now. All of the labour you've provided to collect this information about yourself is now being sold by Google to anyone who wants it. Is your data safe? Safe from what? Google's not going to post your information on the internet. The people they sell it too probably aren't going to do that either. Hopefully your data doesn't document any activity that was, is, or will be illegal one day, because Google give all of it to the government without fee. At this point in end-stage capitalism, you should consider Google to be just another branch of the US government surveillance apparatus. Technically it's illegal for the US government to spy on its own citizens, so they contract that collection out to Google instead. You freely give all of your information to Google, so it's all good.
All this then leads us back to the question that everyone wants answered. What should you do about this file? Leave it alone, obviously. You don't have anything to hide, do you?