Is it still getting new content ?
I'm under the impression it formed a pretty large fanbase.
It's constantly getting new content and features. New modes, seasonal events, Rocket Pass stuff. Next update they're massively overhauling tournaments and are introducing new ranks. Also a new item system and more challenges. The game has been getting better every year.
The playerbase has been actually getting bigger in the past year and the esport is also getting better and better. I love this game and I would have predicted it's dead by next year, but by how things are going it looks like it's gonna go strong for at least the next 3 years.
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