Why isn't soy milk more popular?

None whatsoever. There was a study in the 70s which showed a non causal link between canned coconut milk and soy and estrogen in men- it was later shown to be a result of a glue used in the canning process

Interestingly, there HAVE been links between estrogen from cows milk in men, though in small amounts.

This is bullshit. Also gyno never goes away without surgery

Dude I absolutely agree I make protein shakes from it.

Doesn't necessarily lower test but it may hinder hinders production of it.
ncbi.nlm.nih.gov/pubmed/24015701
ncbi.nlm.nih.gov/pubmed/17416779

meant for