You are right about having the option to report. FCRA does not require reporting.
If you sold to the secondary market and retain servicing rights, you would be able to furnish account activity info to the bureaus. I'm not sure it there are any secondary market requirements that you have to furnish, I have always worked at institutions that chose to report, so have not researched that.
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"It's time for the Jedi to end."
Luke Skywalker