It's pretty well established that people are just generally irrational about free things. Because of this, I think any business model involving giving something

It's pretty well established that people are just generally irrational about free things. Because of this, I think any business model involving giving something away for free, whether it's a loss leader or or ad supported or something else, is fundamentally anti-competetive. Cognitive biases place any competitor charging for the good/service at a disadvantage. If you're a non profit, go ahead and give things away. If you're a business, you should have to charge.