My wife and I have used slack for years for our personal chat. The multiple channels made categorizing the messages easy (ex. #house, #kid1, #kid2, #coding, etc). The change in free retention meant we'd lose important messages so we've given up on slack and moved to a different service.

I'm sure our small usage of it won't matter to slack, but the money grab and their insistence that this change was somehow better for me because it was "simpler" when I reached out to their support really soured my opinion of them. I wouldn't recommend them to others in the future.