Why Does Gtm. Js Scripts Set _Gcl_Au Cookie?

I am trying to deal with GDPR and to clear all the cookies, which must be cleared from the cite. RN I found out, that sets _gcl_au cookie what is uniq id for the client as far as I see in the gtm.js code:

In the internet there are said that _gcl_au cookie is used for "Conversion Linker" functionality or Google AdSense functionality: link to the question

Moreover, gtm.js includes code injecting fbevents/crazy-egg/gstatic scripts on my cite: print screen of code injection

But the only tag I'm using is a Google Analytics. I've found how to disable GA if a user doesn't accept Analytical data using.

But how to stop injecting additional scripts and _gcl_au cookie?

I don't thing that whole deleting of the is a solution

Is it possible to do in a dev way?