forever repeating an action cats-effect question

RepeatEval.scala

/** An effect for infinitely repeating an action, use with care
  * as there is no way to kill the process w/o shutting down the
  * server in this implementation */
trait RepeatEval[F[_]] {
  def repeat[A](fa: F[A], duration: FiniteDuration): F[Unit]
}

object RepeatEval {
  def apply[F[_]](implicit ev: RepeatEval[F]): RepeatEval[F] = ev

  implicit def concurrentBackground[F[_]: Concurrent: Timer]: RepeatEval[F] =
    new RepeatEval[F] {
      def repeat[A](fa: F[A], duration: FiniteDuration): F[Unit] =
        (fa >> Timer[F].sleep(duration) >> repeat(fa, duration)).start.void
    }
}

// in use somewhere else 

  def resource[F[_]: Concurrent: RepeatEval: ContextShift](
    config: DarkLaunchConfig
  ): Resource[F, DarkLaunch[F]] = {
    val path = Paths.get(config.fileLocation + config.fileName)
    val refreshInterval: FiniteDuration = config.refreshInterval.getOrElse(5.seconds)
    for {
      ref     <- Resource.liftF(Ref.of[F, Map[String, DarkLaunchRecord]](Map()))
      service = new LiveDarkLaunchServiceEffect[F](ref)
      loader  = new ConfigDarkLaunchCodeLoader[F](ref, path)
      _       <- RepeatEval[F].repeat(loader.load, refreshInterval).background
    } yield service
  }

RepeatEvalUpdated.scala

// after comment: https://gitter.im/typelevel/cats-effect?at=5f3c9c208b8d4f633efeda1e
trait RepeatEval[F[_]] {
  def repeat[A](fa: F[A], duration: FiniteDuration): Resource[F, F[Nothing]]
}

object RepeatEval {
  def apply[F[_]](implicit ev: RepeatEval[F]): RepeatEval[F] = ev

  implicit def concurrentBackground[F[_]: Concurrent: Timer]: RepeatEval[F] =
    new RepeatEval[F] {
      def repeat[A](fa: F[A], duration: FiniteDuration): Resource[F, F[Nothing]] =
        (fa *> Timer[F].sleep(duration)).foreverM.background
    }
}

// and used 

  def resource[F[_]: Concurrent: RepeatEval: ContextShift](
    config: DarkLaunchConfig
  ): Resource[F, DarkLaunch[F]] = {
    val path = Paths.get(config.fileLocation + config.fileName)
    val refreshInterval: FiniteDuration = config.refreshInterval.getOrElse(5.seconds)
    for {
      ref <- Resource.liftF(Ref.of[F, Map[String, DarkLaunchRecord]](Map()))
      service = new LiveDarkLaunchServiceEffect[F](ref)
      loader = new ConfigDarkLaunchCodeLoader[F](ref, path)
      _ <- RepeatEval[F].repeat(loader.load, refreshInterval)
    } yield service
  }