I've seen GTM take down production multiple times because of marketing shipping random JS with no approvals.
Some random guy in his basement assured someone in marketing they could handle our volume? Chuck their tag in and watch their website get DDoS'ed with millions of requests per minute, which takes out our website because marketing made it fail loudly.
I'm surprised that GTM doesn't handle that. They would have a good idea of how long requests are taking to different domains and limit requests to the slower ones.
Some random guy in his basement assured someone in marketing they could handle our volume? Chuck their tag in and watch their website get DDoS'ed with millions of requests per minute, which takes out our website because marketing made it fail loudly.