The Omicron Hypothesis is a series of articles at Rounding the Earth that broke off from The Vaccine Wars, and includes elements of the following:
The author, Mathew Crawford takes these hypotheses as explorations worthy of consideration and exploration, not as established fact. But that is to say that the complete story of SARS-CoV-2 and the pandemic is not yet agreed upon as established fact. Some of the evidence used was developed by The Ethical Skeptical and others. Igor Chudov also explored Omicron's origins in numerous articles.
A summary of primary open hypotheses explored: