Yeah I think you’re right and it’s sort of the result of a long game of telephone. Soy is a complete protein but it’s a lower quality protein. For example whey protein, which comes from milk and therefore an animal product, is much easier for your body to process and use.

Studies have shown that while both are complete proteins, whey’s amino acid profile for example is superior for muscle growth. A few of the amino acids in soy your body can’t really use that well.

This simple fact slowly becomes “soy is dangerous” as one person tells another and shares a link on Facebook and so on.

People really need to learn to just search up research articles and read a few studies. It’s not that hard to do and it’s generally the most reliable way to learn about something.