Why does Steam need 5 dollars?

Could you please elaborate on why Steam requires a minimum balance of $5 for certain actions or purchases? Is this a security measure, or is it related to preventing fraud? I'm curious about the rationale behind this policy and how it benefits both Steam and its users. Is there a way to bypass this requirement, or is it a standard procedure for all users? Additionally, are there any other platforms or services that implement similar policies, and if so, why?