Our company is thinking of moving to Slack from Teams. In addition we use Salesforce. I have already reached out to senior decision-makers pointing out do we want to be paying for a company's services that resorts to this kind of behaviour, when very credible alternatives exist.
Teams ain't great but I've not really seen any huge argument as to how Slack is measurably better (anymore) and Microsoft wants to squeeze you, but not put you through the Juicero™.
Our business unit within a large public company was using it and we were spun off, Slack was going to be $1M/yr and the CFO/Execs definitely weren't going to pay that.
We are fine on teams, but there was a lot of wailing and gnashing. We had tons of slack customizations, automation, integrations, etc..