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Catbox is a good one.
Or you could host something yourself, that way you got control over your own data.Definitely consider self-hosting for file sharing, because public file sharing sites without restrictive file size and auto-delete limits get abused and shut down constantly. 0x0.st (mentioned in another comment in this thread) used to host files indefinitely but switched to a temporary system because of abuse, so anyone who used it as their file host will now have a mass of broken links. Unfortunately, none of the self-hostable file sharing options with thumbnail previews that I'm aware of support image albums which was the most useful feature of Imgur.
I just tried Catbox, and that is pretty slick! I like how it gives the direct image link upfront, and it's neat how instead of asking for a subscription fee they use patreon and sell merch. Seems refreshingly straightforward.
Just tried catbox also, it is pretty cool, simple and direct. No hidden monetizing. And they have litterbox for temporary storage