They can be profitable. But dependent on patient volume and insurance coverage. Now you need insurance auth for this.
Uniquiely for SUDs, is an additional layer of insurance auth issues, then on top of that a higher no show rate for the patients.
Furthermore, why go to your PHP/IOP if there is no detox? Nor inpatient? If you are willing to go all in for Detox/Rehab/PHP/IOP/Therapy aftercare, then you have a model that can capture people at their willingness AND insurance willingness.
SUDs has stiff competition with national companies advertising heavily.
Are you sure this is something you want to gamble on? Perhaps if you are heavy in meth or cocaine or some other pocket you might be able to target your local flavor of SUD, but even then, many of the folks with Crack/Meth have picked up medicaid insurance. That opens up its own issues.
Good luck if you try it! I won't be clamoring to do so anytime soon in my area.