It's even a nice compliment to watching it on TV because you can watch on a mobile device. ESPN lets you stream stuff if you have a cable subscription, but you can't stream local games with MLB.tv regardless of your cable subscription.
I have always wondered about this. I have to assume television broadcasters (e.g. the regional Fox Sports networks) who pay billions over decades to have broadcast rights want to protect their hegemony on TV. But in general you would think that they could sell their advertisers on the fact they are also being viewed by online subscribers. Maybe the advertisers don't want their otherwise local commercials broadcast, but then that doesn't explain why I can watch commercials when I watch a regional channel from another state.
"ESPN lets you stream stuff if you have a cable subscription, but you can't stream local games with MLB.tv regardless of your cable subscription."
But ESPN doesn't really let you stream local stuff of the US's big 4 leagues. It is unfair to compare the professional sports streaming options of ESPN3, Fox Sports Go, NBCSN, etc with those of the 4 leagues considering that none of the broadcasters can broadcast ANY games, much less be blackout-stricken.
[1] - http://deadspin.com/mlbs-awful-blackout-rules-are-finally-un...
Networks like the NFL Network are doomed as soon as most NFL fans realize they could be streaming literally any game they want to watch from a Netflix-style service, or watch any number of games in a community from a curated Cytube-style list, instead of having just the 1 game at a time.
Edit: TPP had 60,000-70,000 simultaneous viewers on average, with a peak of 120,000.[1] In 2014, each NFL game had about 17.6 million viewers.[2] So an order of magnitude increase. How well does live streaming video scale horizontally?
[1]https://en.wikipedia.org/wiki/Twitch_Plays_Pok%C3%A9mon#View...
[2]http://tvbythenumbers.zap2it.com/2015/01/09/nfl-2014-tv-reca...
Granted that is 14 different events being streamed, but they eclipse Twitch in terms of live streaming by a huge amount.
[1] - http://techcrunch.com/2015/04/07/mlb-com-hits-home-run-with-...
Millions of people watching via livestream, overall (including TV), the largest annual TV event (197 million overall)
Livestreaming scales very nicely horizontally, if done properly.
And this is an event that is completely done without any ads or commercial investor backing it.