Youtube's frequency of ads has become so extreme that I've just yesterday opted to pay 11€/month for YT Premium. I had tried before disabling them with a Pihole or by blocking domains. It didn't work. Also, on a Samsung TV, you can't really install another front end.
It seems to me that Android TVs offer at least some degree of customization because it is possible to install apps there. But the value you get from them depends on whether you can get the root access and on other restrictions the manufacturer has imposed on it. So, in general it is not an ideal usage model.
In my opinion, a pure Linux TVs would be much better. For instance, running Kodi as a frontend with TVHeadend or minisatip as a backend. They would of course have plenty of possibilities to play other media and would be fully customizable, giving the customer a _choice_ to consider and utilize that capability. In my opinion, there is a reasonably sized market for such TVs.