Computer data recovery is expensive because it is difficult, involves expensive tools, often requires professional expertise, and is in high demand. The actual cost of any service will depend on what is required to salvage the data. That’s why the service can range from hundreds to tens of thousands of dollars.
Snapchat takes up a ton of storage because it involves creating and saving pictures and videos. These are data types that eat up a lot more storage than things like emails or texts, so even moderate Snapchat use can hog a lot of data very quickly. That said, there are things you can do to lessen storage consumption.