For anyone who deals with this data (analytics, financial, etc.) for their company, particularly if it isn't of the "two guys in a garage with no real revenue" variety, we take data super seriously. I could lose my job (or worse, get sued) if I was negligent in handing out sensitive company data in a way that put the company at risk (let alone actually caused monetary damage to the business).
A clear privacy policy, details on the team and information about where the HQ is located (so I can make sure they are in my legal jurisdiction should it ever come to that) are the absolute minimum IMHO.
This would be handing your financial data over to a third party to old in an unsecured format. Yikes.
"Slack stores data unencrypted on their servers" ?I see you're using plaid underneath to connect; so giving some assurance that plaid is handling the data flow and sway will not be storing usernames/passwords would be nice (if that is true).
It's important to your customers that you make it clear that their data is safe.
If it isn't, you need to make that clear, too.
Right now, I have no basis to extend trust to you, and no desire to do so.