>> “If everyone started using S3 for this purpose, they would shut it down pretty quickly.”

> “I never said they would kill the feature. I said they would shut down the behavior.”

Seems "it" is standing in for a lot of nuance here.

With these three sentences side by side, still took a while to see how you might be referring to the "everyone using" behavior instead of the "S3 purpose" feature! Usually given ambiguity the nearest plausible reference wins.

Since in tech "shut it down" is more often systems than humans and that was the nearest reference "it" could refer to, took some doing to see how your assertion "I said the behavior" could be accurate!