I’m in the same boat as you and never found anything for Samsung tizen os. Smarttube is android based only and anything streamed to a Chromecast still has ads.
Edit: okay I thought let’s search one’s more. And there is tizentube did not try it yet but seems promising
Damm, for that price you can buy a ds, 3ds, Wii u and a switch (V1) and have money to spare.