Agreed, but keep in mind that person is already technically required to follow standards for things like PII, sales tax, security etc. in addition to accessibility. Small businesses can outsource these requirements to a service like Shopify that knows how to handle them. If you build your own site, then not taking the time to learn and address these issues will always expose you to some legal risk.
This just means that you're asking for all businesses to end up using <the service> that will inevitably turn into a Facebook level service. But everyone will be forced to use it, so there's no choice.
Every business should have a website. But with the ever-mounting requirements it's probably safer for them not to have a website at all. There's no guarantee Shopify will fulfill all the obligations after all.
You're also right about having to comply with taxes. Those are already burdens that will stop some people in their tracks regardless whether their business idea is viable or not.
