I think this refers to streaming from the local cable outlets.  For instance comcast chicago will stream games they already air in chicago.  Rather than them lifting the MLB tv local blackout.  So you would still need your local cable subscription.  As noted, MASN is an outlier.  MASN will likely instead have Phil Wood read the balls and strikes while reminiscing about old DC baseball.  And of course frequent references to the Blos.

Hmm. I was thinking about MLB requiring people to pay for their streaming, like they do now for out-of-market games., but maybe you're right. crap, knowing MASN, they'll never stream anything. They can't even get video clips for Phil Wood's show. It'll be interesting to see how this pans out.