“Normal people” (those unfortunates who live in houses or apartments) receive their mail at the same address that is their legal (or “physical”) residence. The state where their home is located is automatically their domicile.

Nomads may not be at home or have a home but must, for legal purposes must have a legal residence.

Financial institutions (investment companies, possibly credit card issuers and banks) apparently use a blacklist to identify mail forwarders, UPS stores, etc. There is a way to satisfy these institutions:

for an individual, a residential or business street address, or for an individual who does not have a residential or business street address, an Army Post Office or Fleet Post Office box number, or the residential or business street address of a next of kin or another contact individual… – FINRA¹⁾