There's a bit of a difference between FLDS style polygamy and modern polyamory.
Polygamy is about being married to multiple people, but to most people generally refers to situations where men have multiple wives. A "polygamous sect" in Utah generally means a man who is worshipped in a cult-like situation by a group of oppressed women. The wives are groomed through the religion from a very young age to believe that their path to heaven lies in obeying their husband who is closer to god. They're taught that it's sinful to think "sinful thoughts" or to question anything their husband says.
In this case he, quite literally, told them all he was god's prophet, the successor to Warren Jeffs, the equivalent of Jesus, and his followers needed to stop thinking and live in worship, give him their daughters to be his wives, give him their money and work for him, let him control every aspect of their lives and thank him for the beautiful opportunity to be allowed to worship a real prophet and be one of god's chosen.
Not the first time this has happened and not the only active polygamous sect around there. It's super fucked up even without the child sex offenses.
On the other hand polyamory is generally about ethical non-monogamy and involves people having multiple loving relationships (married or not). One of the reasons the term was invented (aside from removing the connotations of polygyny and marriage) was to distance polyamorous people from the FLDS which was often the only kind of non-monogamy that people knew about.
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Not an advertisement. It's still a US company, but compared with something like a Samsung thing they're pretty cool.