If you write the same Gtag code with the same ID twice, can it trigger 2 page views in Google Analytics, or does Google filter for these double cases?
So would it be possible to artificially increase your page view count?
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So to test this, I added the code using the tag method and the legacy code on one page and hit a page refresh.
I had 1 session, 1 user and 2 pageviews. The first pageview has zero seconds on site, the second one is the actual pageview.
The problem this creates is that due to the first pageview being counted as a non-bounce pageview, your bounce rate goes down drastically.
TO answer your question, this can be used to hike up your pageviews. However, sessions and users remain unchanged.