In Scala 3, implicits live on under a different name. They're called _given_s. But they're reduced to just one use case: propagating a context through (and deriving one given form others). And Type Classes are subsumed under this use case.

The other use cases have been essentially removed:

* Extension methods are now its own feature, relying on completely different mechanism * Automatic conversions have been severely curbed and de-emphasized, although they are still there, but much more explicit