Yes, the systems we construct within this reality are obviously not the bottom of the stack because we built the stack. But suppose the trading bots figure out

Yes, the systems we construct within this reality are obviously not the bottom of the stack because we built the stack. But suppose the trading bots figure out how to manipulate the rounding mechanics of high frequency trading to jerry rig a Turing machine within their reality. Now fast forward from this and suppose they've all obtained an equivalent of a home PC. For fun they all start playing a "sim city" like game version of our reality. So far as they can tell, money is real reality (rather than socio-economic construct), and the "physical" reality is an abstract game constructed at a higher level. So who's reality is who's construct in the end?