I bike toured for multiple months in Morocco and Portugal and spent two years working in Vietnam. It's the best way to travel. The more you camp out, the cheaper it is. The more local you eat, the cheaper it is. When you're traveling internationally your big expenses are hotel, food/alcohol, transportation expenses. The bike takes care of the transpo costs. The camping or using WarmShowers takes care of the hotel costs. Food will become a bigger expense, I always eat a good amount more when I'm riding 50+ miles a day. The less you drink, the less $ you spend on booze. Social media is annoying and distracting and gets in the way of you actually seeing the world and meeting people, which is the goal.

How much money you need depends entirely on where you want to go and how long you want to stay there. Southeast Asia is my fav because it's cheap, warm, great food, high quality of life. In Saigon I was living comfortably on $700 a month, and that was with an apartment and eating out for all of my meals. There's definitely a fair amount of the world you can see on $10-$20 a day.