This has been pointed out a number of times in the recent past already. Nothing's new. And it's not just Swapgate and Quickex that are connected. There are more of them. Perhaps most of the unknown exchanges that have been sprouting here like mushrooms probably share the same origin. Other exchanges like Sapfirex, Jarvis Exchange, Tasty Changer, among others come to mind. All of them might be operated by a single entity.
Some of these exchangers have certain negative reviews or, for example, have been delisted from monitoring sites. Their reputation is the only thing that can attract new users, so in case it is damaged, it is easier to start a new exchange service, with a clean history.
At the same time, there is not much reason to close old sites, because the maintenance costs are very low, and they do not risk any money because do not hold any reserves, they are only resellers.
These are more or less disposable exchanges. They neither have a track record nor a reputation to begin with. If one starts bad, it can be abandoned right away. They're unknown brands anyway. They'll quickly launch another. Or it seems they're launching several at the same time, probably hoping one of them will somehow achieve something in the market.
Here on the forum it's somehow obvious. One that isn't pestered by criticisms, questions, concerns, and so on gets bumped every now and then, perhaps targeting a certain degree of name recall in the community. But one that is met with snide comments right away is left to die.