"Why not a Warning"?

Because SE has given us plenty of warnings on plenty of things, yet people chose to ignore them. At this particular point, a "Warning" is insufficient.

SE has asked us, multiple times over the years to Not use ACT or any 3rd party tools. While yes, it was more on the fence of a "dont show, don't tell" sort of scenario and I believe that will still remain. The issue is people being upset that people who actively broadcasted to the public that they were using 3rd party tools finally got slapped for doing it.

But why are they upset? Because it's "their streamer". Their pal, their best friend that doesn't know they exist.. Para-social relationships festering and hitting a boiling point. You can already see that coming to a head, with plenty of streamers being mass-reported for literally anything that could be against ToS. From 3rd party tools, to harmless UI shifts, to things that don't even show up in-game. (See above post)

There is blood in the water and people are currently going feral because of it, lashing out at the harmless because it's still technically against the ToS.