Seax-Wica is unusual among Wiccan traditions in having a founder who told everyone exactly what he was doing and why.
Raymond Buckland was the Gardnerian High Priest generally credited with bringing that tradition to the United States. In 1973 he created something deliberately opposite to it, and published the whole thing in a book, The Tree, the following year. There is no oathbound material. There are no degrees. Self-dedication is fully valid, Buckland said so in as many words, and a coven elects its leaders, for a fixed term, rather than being run by the High Priestess who initiated its members.
The symbolic dress is Anglo-Saxon, honouring Woden and Freya. That framing is chosen rather than inherited: Seax-Wica does not claim to be a reconstruction of Anglo-Saxon paganism, and Buckland did not pretend that it was. The gods are a symbolic vocabulary for a Wiccan structure, which is a candid thing to say and an unusual one.
The reason for all of this was the reason people usually give for founding something. He had come to think the parent tradition's secrecy, hierarchy and lineage-consciousness were doing more harm than good, and that a person with no coven within two hundred miles should not thereby be excluded from a religion. In 1973 that was a minority view. Within fifteen years it was the majority practice of Wicca, arrived at largely without reference to him.
Buckland also published the tradition under his own name, making no claim to have received it from anywhere, which at the time was itself a departure from how such things were presented.