Given the health and medical play, I think they're questionable in at least a couple of ways.
- There are no actions to be taken based on microbiome data
- There's no government oversight to the quality of their sequencing or bioinformatics
- The reviews don't indicate the kits are useful https://www.highya.com/ubiome-reviews
Maybe a good comparison would be if Theranos gave you a 'subjective wellness score' instead of standard test results