Hopefully there isn't much to worry about. Although there is a stigma, buying or owning bitcoin isn't illegal. River has all your kyc info. 
If they say anything just be like, 'Hey look, you can buy bitcoin at Blackrock, fidelity, etc.. ' 

 Yup... both an unfortunate but also somewhat fortunate thing in this case that they have my info. And yeah, good point, with the ETFs and whatnot.