I wouldn't hold my breath...
Molotov uses DASH subtitles. Just like Discovery+. Just like anything that has an MPD really.
I have asked repeatedly for them to fix Discovery+ subtitles and i have even laid out the steps i use on DRM-free sites and yet, still nothing. Extremely frustrating.
Now that Warner Brothers owns Discovery+, i am very afraid that DRM is coming to Discovery+ shows and i won't be able to download my shows with subtitles.
Yes i could just sub to Amazon US' Discovery+ Channel but the bitrates are way too high for dumb reality shows...
I don't understand why they are not just parsing the MPD for subtitles and download them. Take a look at the MPD file for "Pour une poignée de dollars"
Opening it in Notepad++, we can see there are 2 subtitles. French and Italian:
          id="3"
      group="3"
      contentType="text"
      lang="fr"
      mimeType="application/mp4"
      codecs="stpp.ttml.im1t"
      startWithSAP="1">
      
              timescale="1000"
        duration="1920"
        endNumber="3013"
        initialization="REDACTED-$RepresentationID$.dash"
        media="REDACTED-$RepresentationID$-$Number$.m4s">
      
              id="3=1000"
        bandwidth="1000">
      
    
          id="4"
      group="3"
      contentType="text"
      lang="it"
      mimeType="application/mp4"
      codecs="stpp.ttml.im1t"
      startWithSAP="1">
      
              timescale="1000"
        duration="1920"
        endNumber="3013"
        initialization="REDACTED-$RepresentationID$.dash"
        media="REDACTED-$RepresentationID$-$Number$.m4s">
      
              id="4=1000"
        bandwidth="1000">
      
    
I mean it's not rocket science.
The subtitles are not even DRM protected like on some other sites using MPD so i was able to download the French subtitles and convert them from TTML to SRT using the steps i describe in that linked post.