Why is it a gray area? Compliance applies depending on what is posted. If a SN site for the bank advertises consumer loans, Reg Z applies, deposits, Reg DD applies.
Here is a list I have that I use when I teach on SN and compliance.
UDAP
Reg DD
Reg Z
FDIC membership
Fair Housing
NDIP
Retention
InfoSec
Complaints
Risk mgmt (not a reg, but applicable.)
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AndyZ CRCM
My opinions are not necessarily my employers.
R+R-R=R+R
Rules and Regs minus Relationships equals Resentment and Rebellion. John Maxwell