Why torrent uploaders share their files?

I'm confused. Do they receive benefits for sharing it to the community or maybe they are just Big hearted persons. Is this risky for them because it's illegal? I just downloaded one file and I'm so grateful for them. Whats is really their reasons for uploading large files like movies, music, and even... show more I'm confused. Do they receive benefits for sharing it to the community or maybe they are just Big hearted persons. Is this risky for them because it's illegal? I just downloaded one file and I'm so grateful for them. Whats is really their reasons for uploading large files like movies, music, and even apps? Do you think is illegal to share it?
Update: first answer. Let me guess are you an uploader?
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