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Unfortunately it is indeed used for non-ad scripts. For example, Hearthstone on iOS fails to render the login page if GTM is blocked at DNS.

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Indeed, one perspective on using GTM is as another avenue to customizing websites without using a developer.

Yep, that's exactly what a tag manager is. It lets the marketing department make changes, without the IT department getting involved and slowing things down with non-money-generating activities like code reviews or testing.

It's used to add tracking and advertising. But I've also seen it used for chat bots and chat agents. I've even seen it used for bug fixes that designers wanted to get out the door quickly.

I'm sorry, you lost me, where is the problem here?

The problem that he seems to be alluding to is that general problem of WYSIWYG cp. bespoke software - in particular, when tools like GTM are used in a way that adds to requirements cruft and detracts from software reliability.

Precisely

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