Ezra Klein at Vox.com explains:
Here, in short, is what the AHCA does. The bill guts Medicaid, halves the value of Obamacare’s insurance subsidies, and allows insurers to charge older Americans 500 percent more than they charge young Americans.
Then it takes the subsidies that are left and reworks them to be worth less to the poor and the old, takes the insurers that are left and lets them change their plans to cover fewer medical expenses for the sick, and rewrites the tax code to offer hundreds of billions of dollars in tax cuts to the rich. As Dylan Matthews writes, it is an act of class warfare by the rich against the poor.