> Thank goodness you took the time to let us all know this....
Be honest; how many times have we seen this? company, org or person flat out rejects an open source solution (which, most importantly, would actually work for them!), gets charity from the proprietary supplier and then complains when that charity comes to an end?
How many more times must we see it?
When working FOSS applications are rejected in favour of a proprietary product, well, there should be some pain for that decision.
If, as a technical decision maker (manager, founder, whatever), you make an unusually poor decision, you should get blowback for it.
For a long time there was literally no need for any decision maker to go with a proprietary chat solution. Anyone deciding to go with Slack, from this point onwards at any rate, deserve all the scorn they get.