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Some of the biggest internet companies use AWS. To just name a few Netflix, Airbnb, Adobe Systems, Autodesk… Also, some of the managed WordPress hosting solutions are hosted on Amazon Web Services. Since you have a middleman between you and AWS, cost of running a website might be greater. Therefore if you cut the middlemen (hosting provider) and move WordPress site to AWS, you might save some money.
With AWS you are making your hosting solution on Amazon’s server.
The unique thing about AWS is that you pay only for what you use. This might be appealing to a business that does not get a lot of traffic. However please note if you get a large spike in traffic it’s going to raise your costs. That said Amazon has a monitoring and notifications service so you can follow your site traffic and know if it’s going to exceed some limit.