Ethics of con artists

[Spongebob]

I once had a longstanding debate with someone about the ethics and morality of people who swindle millions of dollars out of gullible marks.  You can imagine just about any sort of con artist you like, from promoters of medical pseudoscience to televangelists.  Since learning about the existence of pseudoscience, I've been a vocal opponent of any such practices, but my interlocutor casually supported the idea as ethical/moral because it served its intended purpose, which was generating money.  So, in a society that values making money over everything else, that probably makes some sense.  And if America doesn't fit that description then I don't know what does.  So my question is this, do you consider such practices to be ethical, moral or otherwise acceptable and why?  If anyone needs an example of such practices, just consider the many scam treatments and other way to address covid-19:

"ISM5 Invisi Smart Mask," "ISM5 Invisi Smart Mask (Black Edition)" and "ISM30 Invisi Smart Mask"
“Patanjali Coronil Kit,” “Dr. Reckeweg Arsenic Album Dilution 30 CH,” “SBL Arsenicum Album Dilution 30 CH,” “Kerala Ayurveda Balarishtam,” and “Kottakkal Balarishtam"
Salt scrub products
A non-alcohol-based consumer antiseptic nasal product
Neutralization Antibody Test kit (Colloidal Gold, Fluorescent, Elisa), a SARS-CoV-2 Antigen Rapid Test Kit (Colloidal Gold Immunochromatography), and a Saliva Antigen Rapid Test 
Nitric Oxide Support and Melatonin products
“COVxRDA Saliva Antigen Test” and a “COVx-RDA Nasal Antigen Test”
VIVERA + OMECARE Home Specimen Collection Kit
“Germaphobe’s Delight Spray”

https://www.fda.gov/consumers/health-fra...9-products