It's so funny to me how particular developers are about testing and version control, then they give non-developers the ability to dump any old third party shit on the page. That's what Google Tag Manager lets happen.
If your marketing team has access to GTM with no audits or controls or engineering review and oversight over 3rd parties, then you probably send PII without knowing it too!
@heydon real story. The marketing department complained to my team about the website performance. They'd GTm'd it to death. I used an analogy:
We're a team of chefs who carefully craft a beautiful dish. You're the waiter who splurges ketchup all over it as soon as it leaves the kitchen.
@tommyp @heydon I once had a manager who added a snowfall effect script via GTM to an ecommerce website for Christmas.
He hadn't consulted the dev team - it just appeared one morning.
The performance was dreadful and the snow would build up when it landed, which meant all the payment buttons on small screens were soon buried under snowflakes.
You couldn't even click through them so there was no way for mobile users (the majority of our users) to buy anything.
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