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better try to secure your siteIt sounds as if nothing is happening on the site itself, only in GA, which lives on Google's servers and is therefore Google's to secure.
I examine various server records several times a day. I've seen it less and less though.That sounds like yet another aspect of a widespread shift. Compare referer spam, which originally involved robotic requests visible in access logs, and now is more likely to happen purely at the GA level without anyone ever setting foot on your site.