Google is reliable when it comes to payment. If you reach the $100 threshold you will get paid and you know Google is not going out of business any time soon.
This is very important because a lot of people invest their time and money with an online company only to find out that the company went out of business suddenly without paying them. In some cases the company had a faulty business model and could not pay out the people using the services and in other cases the company was simply dishonest and running some king of ponzi scheme. In these cases, the result is the same, you don't get paid. You will not have this problem with Google Adsense as long as you do not break any of their rules.
It is most important that you read and become familiar with all the terms and rules regarding what you can't and cannot do with Adsense on your sites. If you break any of these rules you may not get paid. Worst of all, Google might suspend your account permanently. Therefore, you need to be careful and always follow the rules. The more money you are making with Adsense the more important this point becomes because the stakes are obviously higher for both you and Google.
The other interesting thing about Google Adsense is that it is truly international. Unlike sites that work only with people in the US or Canada, Adsense will work with people in most countries around the world. There are a few countries that are excluded because of regulations in the US. These countries and territories are: Crimea, Cuba, Iran, North Korea, Sudan and Syria. This list may change at any moment if US policies change. However, if the country you live in does not have any political conflict with the US you don't have anything to worry about.
