In reply to Nick.

But they don't necessarily own your data. Squarespace makes it straightforward to export your posts. Wix does NOT. Shopify has your product data and I'm not sure how are it is to get that out but they have a good ecosystem to which they connect so you can and should have your customer data in a CRM, sales data in Xero, etc.

While I don't mean this as personal attack, your rant simply turns off business people. All they care about is getting stuff done and as long as they can get at their data, they simply do not care about GPL, etc.