> 90mA in full-speed run mode.

Keep in mind that's at maybe 2 volts rather than 5 volts. Still, it's 360uA per MHz, counting the two 125MHz M0+ cores as 250MHz total. That's pretty power hungry compared to other Cortex M0+ products which tend to be in the 100uA/MHz range. I think the real product here is the RP2040 SOC and the Pico board is described as a breakout board for it. I like to think the RP2040 will find its way onto future RPi Linux boards, to give them some analog and realtime capabilities.