They’re all made around cheap frames and bits from the East. Companies doing them seem to come and go.
I bought one in London from a now defunct company named Moritz, and it’s been fine. They’re not complicated bikes. I went through one chain and replaced a lot of the kit on it with nicer bits. Selling it soon because it isn’t suited to Yorkshire.
Some of the components on that ebay listing are identical to the one I got when it was new, just with different brands on them. It’s not amazingly confidence inspiring when the bars have something like “TIANYOU. Established 2012” on them, but nothing ever broke catastrophically.