Adobe native apps modify your `hosts` file to see from the Web if its software is installed: https://www.osnews.com/story/144737/adobe-secretly-modifies-your-hosts-file-for-the-stupidest-reason/.

LinkedIn scans for traces of installed browser extensions: https://browsergate.eu/how-it-works/.

Regular people outside of our tech bubble here on Mastodon have no idea any of this is happening, or even technically feasible.