depositfiles and hotfiles same purpose but diffrent intentions

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Depositfiles and Hotfiles served the same purpose, here you can upload files and within your file uploaded if any people downloaded your files you can earn with a little amount. The question is not about what you earn when you upload your file. The question is why "Depositfiles" delete your uploaded files after 3 months? Is it after they already copied your uploaded files and its not yours anymore? Similar to "Hotfiles" you can upload as many files as you can and you can earn with it,but if you don't record your uploaded files link it won't be your anymore.