Because it costs a lot of money to run a website like Upwork. It's not a charity.
I would like to warn you that with a profile like yours, you're going to be a big target for scammers. It's extremely difficult to get legitimate data entry work here, and it usually pays no more than $3-5/hour. Please read the terms of service and this link before you send any proposals: Top Red Flags for Scams: From Community Membe... - Upwork Community