Isn’t pixelfed more Instagram than imgur? I think they should still implement those 3 because the best way to get people on lemmy would be to get the established content creators using those platforms. Redgifs for example is a very good host for NSFW works.
There should be a failsafe for this because as this grows, you’d also have a lot of servers which are not feasible to maintain anymore and thus they’d go down. Maybe an instance dedicated to archiving could work. Other instances could refer to that archive in order for users to migrate without losing their settings.