OK, well you do what you like then. I'm sure your clever enough not need to show how to suck eggs.
The link you sent says ‘After purchase please send us your images by Ebay message’ by the way lol When you do it yourself you get to choose how much you zoom in on the photo and exactly how you want it positioned.
1) then get an account, it's not exactly a dodgy website 2) actually it's normally done via email 3) as per above, in fact, the sellers are professionals (surprised??) they know how to use the print machine to align and colour balance should you need it. I had a 27 image stitch (yes, v big 200mb++ image), I wanted to put on 3 canvas as a pano shot and they were clued up enough to know how to frame it, colour balance etc. Obviously I did colour balance on the screen but they also have to do it on print. V professional for the amount you pay to be honest. Or maybe they put more effort in because it wasn't a typical Facebook crop image... (embarrassed)
1. Some people don’t have ebay 2. You send the image through eBay message so probably wouldn’t be as clear as if u uploaded it yourself 3. You can’t choose the amount of zoom or where you’d like the picture situated on the canvas if you send it to an eBay account lol
Unless there's something special about this company or print quality (say uv, gloss, etc), it's not a good deal. https://www.ebay.co.uk/itm/352213230883 £13-14 here with buy2 get 1 free, that's normal price. With many sellers around. I've use these and another marginally more expensive ones before but never needed to pay £25 for anything around a1-a2 size. Edit: lol on their price promise; 'if you jump through all our hoops for price matching, then we'll give you massive 5% off... Voucher for next time we fleece you!' (y)