My biggest issue with them sending the tests out is the false negative rate of antigen tests.
For example, I talked to a friend who was feeling a bit under the weather before Christmas, fully vaxxed and boosted. Took a rapid antigen before flying up to visit family, negative. After landing, felt awful, got a PCR and was positive, quarantined and didn't expose family. N=1 anectdote, but I've spoken to many others whose antigen didn't detect their eventual covid.