Let’s be entirely honest, it would be unreasonable to assume they aren’t going to log every bit of data they can.
I don’t know why anyone would assume they aren’t going to link it with the IRS, and make it available to any agency that asks.
If the plan is to offer a “money request” service and offer much the same functionality as Venmo, there will be a “for” line.
Even with credit card payments now, they are coded at a minimum.
Everything is logged always.