It turns out that TinyTapeout doesn't gate the power to the digital submissions, so they need the GDS to be auto-generated to not take down the whole chip. If

It turns out that TinyTapeout doesn't gate the power to the digital submissions, so they need the GDS to be auto-generated to not take down the whole chip. If you want to route things yourself, I suppose you could use their new analog pin support, for which they gate power to keep the rest of the chip safe.