The people following this particular stupid trend wanted people to believe they had an illness. They got what they wanted, though perhaps not quite in the way they wanted.
If you're poor and say that you speak to God, you're labeled as somebody with a severe mental illness and possibly institutionalized, potentially for life.
If you're rich and say you speak to God, you can run a church, funnel a ton of money into your pockets, and evade taxes.