SmartTube is an advanced player for Android TVs and TV boxes, free & open source. You can play content from different public sources.
Features: no ads ‧ SponsorBlock ‧ adjustable playback speed ‧ 8k support ‧ 60fps ‧ HDR ‧ read live chat ‧ customizable buttons ‧ no Google Services ‧ helpful international community
Disadvantages: no support for phones and tablets, no comments stability, voice search and casting support might be worse than in the official apps, depending on your device; give it a try!