Bottom line up front: Prevent spam in your Google Analytics with only 2 filters
Google Analytics is the most widely used web analytics service today so it is a target-rich environment for spammers to get eyeballs. They hope that web masters will see their url and check out where the traffic is coming from. The reality is there is no new traffic, it’s all bots manipulating the system.
Google Analytics spam is only bad for the site owner. Users never see the consequences, but the owner’s stats are full of junk, devaluing the data.
After long neglect I’m busy behind-the-scenes with this and other websites. My painful reality is bad guys hitching a ride on my corner of the web. Take care of your neighbourhood unless you want to it to go bad.