Getting people to buy stuff online is hard. You have to setup a store, find a supply of products, get your store known through online marketing before you can make a single sale. And once you’ve managed all of that, you’re not exactly done yet. Conversion...
Sending messages has always been a paying service. No messenger will cover long distances for free. There’s the cost of transportation, of course. The integrity of the message itself and precautions you have to take to avoid it being stolen or read....
Once upon a time, bloggers only had newsletters and e-mails to contact their readers. Spam made things harder, inefficient, and more expensive. Then push notifications arrived. Initially for mobile applications, then websites, push notifications became the de-facto...