Not every fact in your family tree deserves the same level of trust, and MyOrigins does not pretend otherwise. Every finding gets tagged with how strong its evidence actually is, following the same basic idea genealogists have used for decades: some sources are direct, some are secondhand, and some are just plausible guesses.
A fact backed by a direct record - a birth certificate, a census entry, a land deed - gets treated as solid. A fact that comes from a secondary source, like a family history book written decades after the fact, is treated as reasonably reliable but not certain. Family tradition - something a relative told you, with no document behind it yet - is kept and shown, but never confused with something that has actually been verified.
A hypothesis is different again: it is a lead the research engine thinks is worth chasing, based on circumstantial evidence, but has not confirmed. Hypotheses are useful precisely because they are labeled as such - they tell you where to look next, not what to believe yet.
Knowing which tier a fact carries lets you decide for yourself how much weight to put on it, rather than treating everything MyOrigins tells you as equally certain.