If it was illegal them I’m sure the state prosecutors will take care of it.
I dislike Google as much as the next guy but this seems like a minor issue in a list of huge problems
in every country i am familiar with, disobeying an order from a regulator is already illegal.
If it’s illegal fine them billions for all i care
In Finland prosecutors are not involved in most of the illegal things, they are only involved in criminal matters (and in some cases civil compensation claims which are linked to criminal case). Various regulators/authorities are the ones who enforce civil side.
In many cases the penalties that law allows those to authorities to issue are limited to ordering to stop doing that illegal thing, reprimands and conditional fines ("if you don't stop you need to pay fine"). Straight up fines tend to be more uncommon (unless individual is doing it, then fines tend to be very common). Targets of these can then file appeal in administrative court and usually behavior is allowed to continue while case is appealed (see e.g. various GDPR/ePD cases).
If the law is not sufficiently protecting Finnish interests here it should be changed.