It's not intel. There's a thread buried somewhere in the intel motherboard forum - it's the motherboard makers trying to make the review benchies look good, by being "faster" than the others.
IIRC, Asus doesn't do this - but everyone else does. Gigabyte and MSI pushed it the most, I think - playing with voltages and the like. My z490 Master had all-core max boost set from the factory. Have it off right now so I can sanity check a weird crash (bad driver from windows update, I think).
Asrock is pretty stable when you turn off the out of the box auto boost also.