@whiteoutmashups an easy way to deal with that kind of stress is to realize - there’s an ebay, and an amazon, and a openbazaar and an upcoming safex… and upcoming another more marketplaces of varying custom kinds… indeed something as described as safex is next level but only because it uses Safe Network for its backbone just like all other apps of the future that might do the same (use Safe Network as backbone) and those ones too will be next level and ground breaking.
On the other hand - when you bought some mandarins at the store that one store didn’t know you were coming, just as easily could have bought them at a different store too but you already gotten your mandarin satisfaction. That doesn’t mean that only 1 store will stock mandarins for the whole world.
Same thing with all these marketplaces and everyone of these app ideas and all these coders… there are more things to code than there are people available to code them; and also think about how many messaging apps exist… there’s forums and chat rooms (both are messaging apps… not solved by one single application) we have different flavours of forums different styles of chat apps too. Indeed they don;t just hocus pocus magically poof app exists… it is built iteratively, with time, attention, and effort
The world is your oyster.