You don't have to use the same image for the feature as the embed preview. The featured image is often the default (and you have a fallback just in case), but you can also choose to replace it for socials. Don't know what this is built in (on mobile) but it could just be using a different file.
I haven't seen this before so grain of salt but I'm assuming it's just to be eye-catching so you click to their site. I'm also assuming you wouldn't want it to be a gif on your own site because of accessibility concerns, but that depends on your requirements which vary pretty widely by country.
They don't ship in general besides the local area near their factory, it's pretty frustrating. Their website does list certain retailers that carry their shoes but with an outlier shoe size not having a way to place a custom order means I can't support the business despite needing to replace some boots and wanting to buy canadian.