There is not any privacy-respectful business that won't eventually be acquired by private equity and squeezed for every just-this-side-of-legal dollar they can get.

Don't give away your genetic information if you can avoid it.

Your best bet is probably to go through a doctor and get testing from a medical genome sequencing service that is covered under HIPAA. I am not 100% sure if this is bulletproof, but it is probably better than going through a DTC company. Plus, most DTC companies like 23 and me use imprecise genome sequencing and not full genome sequencing like many medical providers do.