Couple observations on an iMac I happen to be using:
Nevertheless, following a restart the syspolicyd process consumes a considerable amount of CPU for a few mintues before reverting to about 8 - 10% CPU.
Normally syspolicy is doing nothing on that Mac: 0% CPU. However, upon restarting that Mac it exhibited the same behavior, with syspolicy occupying roughly 50% CPU for perhaps twenty seconds. Since it is rarely necessary to restart Macs (this one had been up for about three months) I suggest that particular anomaly is not a factor.
If you identify a particular app or process occupying an inordinate amount of CPU time in the Activity Monitor app, it's not a bad idea to use Console in an effort to track down the cause. However, even Activity Monitor adds to the CPU load, but more importantly Console is a lot more burdensome. It was educational to identify syspolicyd as a culprit but the information it provides ("failed to call driver") does not tell us which driver was causing the difficulty. 0x3 is just a number (three). The only way to do find out which driver it may be is to methodically eliminate each specific system modification as a cause. Spotify was a good guess since you already knew it was problematic. Most likely it was attempting to sign in to a Spotify account and was having difficulty, but who knows why. If you want to track down the cause you'll have to do more investigation along those lines.
To identify potentially contributing factors EtreCheck is a good tool that won't burden a Mac unless it's actively running: https://etrecheck.com/en/index.html
Obviously don't leave Console up and running all the time. It will have a detrimental effect on a Mac's performance. Same goes for Activity Monitor, but its effect is much less.