What’s Sponge nowadays?

I have close to none experience when it comes to modded servers, I hardly ever interact with those projects. Even worse considering that I stopped doing servers in general for 2-3 years maybe.

Around 2017 I tried Sponge as hybrid server for a friend smp
Today, I just checked Sponge page and apparently has become something entirely different with three variants: SpongeVanilla, SpongeForge (likely what I used back then), SpongeNeo (neoforge)

They now have their own ecosystem of plugins called ores and support forge mods
But what is it now?
Back then (from what I remember) was close to what mohist, cardboard and similar projects were, integrate the bukkit api into the forge ecosystem, but now it has a vanilla version apparently?
And have their own plugin browser instead of having to download then from spigotmc?

I got sort of confused and their “About me” is not that clear to me when compared to the Sponge I remember
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