@fdufnews many people use ESP8266 with the Pico's voltage regulator (that's what is done with the shim). It will run without an extra cap, but it's a good idea to add one.
As @the1laz said, it's capable of 250mA constant power consumption, which is more than enough for ESP8266. It can still deal with the odd peaks of power consumption.
If you ran from more than 5v, heat dissipation might trip it up, but from USB it's absolutely fine.
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