I believe they are making a business connection, even if you have a competing product building connections should be part of it.
The product speaks for itself connection wont change peoples minds on the service
That’s for personal use to get trades and also trade.
You’ve also got to consider some people are very anal about their accounts, I used to have people come in to the bank I used to work at with a varied demographic who would purpose withdraw out the pennies, this mindset follows into other spectrums of finance, you may be surprised of an uptick if it’s only a toggle. 
Some people really do live by the saying “If you look after the pennies, the pounds will look after themselves” 