Pretty much all Shopify shops have their own domains, only a minority drive traffic to their .myshopify.com subdomain
Seems someone would first effect to have a better branded site. As in, a decent TLD.
And that if anything, this is a kick in the pants of an ecommerce site to get its own domain(s) to deal with this.
Do I have that right?
FWIW, it looks like a 301 to a new domain should transfer the seo juice. If the site is valuable, a new domain should stand up pretty well. It also decamps from myshopify.
This all seems more valuable to the store owner, but I get why people would want to avoid all those changes and just try to figure out the thing "Apple is making them do."
Of course, that specific example, since Google is trademarked and well known might get you on the wrong end of Shopify's ToS or a UDRP request either way.