I am not sure I understand your question. Made what way? Made primarily as an alkalai salt of fatty acids? Or made primarily with detergents?I don't know of any MP on the market that isn't made that way. Are you aware of a brand that doesn't?
Perhaps this article by Marie Gale will clarify, whichever way you meant your question:
https://www.mariegale.com/melt-pour-soap-soap-cosmetic/
Keep in mind, Marie Gale writes as soap pertains to US laws, so it may not be the same in other countries.