Because in scala `Try` is a kind of `Future` that doesn't run on a separate thread

gistfile1.scala

import scala.util.{Failure, Success, Try}
import scala.concurrent.future

implicit def tryToFuture[T](t: Try[T]): Future[T] = t match {
    case Success(s) => Future.successful(s)
    case Failure(t) => Future.failed(t)
  }