neither to be honest.

maybe it was a little bit risky opening with "Hello, it's me" like what if the GP had forgotten her/didn't care.
but the song and vid is safe.

SIO is a typical max martin production.
she was very pop on red already so it's not like she really changed genre

how was SIO remotely risky?

neither is the only correct snswer

two of the least risky songs ever actually

what?

is it not risky to release something completely different than the usual?

SIO

Shake It Off is a safe song for any singer but in comparison to Hello (which is boring and the safest song Adele could choose - especially as it sounds like every single song she has ever made) . Shake It Off isn't risky in any sense but was a start of a new 100% cohesive genre for a Taylor album.