Just to save anybody the trouble who needs FIPS approved encryption for host OSes that you use at work for various compliance programs. This makes Bottlerocket a non-starter for us. A very active issue has been open for over 2 years on this and the dev teams don't seem to be convinced that this is important. We even communicated with the dev team through our dedicated AWS reps and they have no interest in adding this.
Here is the open 2+ year thread on this: https://github.com/bottlerocket-os/bottlerocket/issues/1667