The bill, as currently written, kicks in only above $1 mil in sales to states where the retailer has no physical presence.
If true, this seems reasonable. America is (was) built on providing a level playing field for everyone. Internet retailers have benefited unfairly -however, consumers have benefited which is nice. A million dollar limit allows smaller and medium sized startups to maintain some competitive edge as they seek to stabilize. For big online retailers like Amazon it could be a killer - though with their free shipping via prime