Think of the typical consumer of web apps, like people who run Wordpress and Shopify sites and click their backend together with tools like Zapier and the like. How can they comply without an universal protocol embedded into all the tools they use, without losing the advantage of automation? They have to delete stuff manually, and hope that the marketing tools they use provide options to delete it.
What GDPR does is that it makes starting your own business less attractive, and funnels people back into the traditional work environment. And by doing that they also reduce the amount of potential customers for smaller startups aiming at small business and these people.