> If you want the premium features, their pricing is very affordable.

"very affordable" is up to each person to define. One of those premium features is a history with more than 10,000 messages.

I frequently interact with at least 25 people just to do my job. The cheapest paid plan is $6.67 per user per month. That works out to $2000 a year. And that's only for the people I work with on a regular basis. Sure, I could afford that, but it's certainly not trivial. Email looks like a good alternative at that price.