Why smart meters are free?

Could you please explain to me why smart meters are offered for free? I've heard they can help with energy efficiency and cost savings, but I'm curious about the economics behind offering them at no cost to consumers. Are there any hidden fees or strings attached? Additionally, how do energy providers benefit from installing smart meters in homes and businesses, and does this ultimately lead to increased costs for consumers in the long run? I'd appreciate a clear and concise breakdown of the advantages and potential drawbacks of this arrangement.