The thing is that F1 is so close, and so technical these days, that the kind of basic information required to create a reasonable sim model just isnt 'trade secret' enough to be worth that much.
You need the weight distribution (which doesnt vary much between cars anyway), a rough engine torque curve (which again doesnt vary that much between teams, and peak power is worked out by F1 pundits anyway from trap speeds etc.), some suspension geometry which can be interpolated from photographs anyway, some rough tyre data, and some rough aero coefficients.
To get a reasonable sim model, none of the data needs to be accurate to the nth degree, just within the bounds of variation in a typical F1 car, so there is no risk of giving away info to competitors that they would find useful in any way.
The secrets are in how they get their cars to acheive those parameters, not the parameters themselves.