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Yes, I will do something like this. However it doesn't alleviate the overarching concern that they are behaving in a way that treats my business very recklessly.

I use Slack like this for various notifications. I just setup a new Slack instance and created channels for each notification area (smart home, media server, etc). Now all the software in those various areas can send messages (via webhook) and I can set the alert preferences per channel. Makes it easy to quickly look at Slack and know things are running fine.

I also have a #critical channel anything can post to that always has alerts enabled on my phone so I don't miss anything important.

It actually works pretty well and costs nothing.

Then what do you do when Slack bans your account?

Self-host Zulip - which in my opinion is better than Slack anyway and supports slack incoming webhooks.

https://zulip.com/

I'm going to guess that slack would not ban for this reason. It would not make sense at all.