Wasn't Meerkat done in by the fact that Twitter launched Periscope around the same time? Twitter cut Meerkat's access to the API at SXSW (mid March), and published Periscope to the iOS App Store in late March.
On top of this, I've noticed some celebrities I follow on Twitter using Periscope and advertising it to their feeds, which I wouldn't be surprised to find out is fueled by some form of payment from Twitter.
I can't comment on Peach, but I get the feeling Meerkat's demise was because they were out muscled by Twitter.
I think it's a little bit the competition from Twitter's own product and a lot bit that live video broadcasting is a pretty small niche. I don't think there's room in the market for multiple participants.
Following celebrities on Twitter is the newest form of celebrity gossip, which itself is just a modern rendition of one of the most human of habits, gossip. Gossip is the human version of the grooming seen in other apes, and it is as much a part of the human condition as war. When everyone was uneducated and lived in small villages, as was the case for the majority of people until only a few hundred years ago, there was nothing to talk about except for gossip. Just because we now have more to talk about doesn't mean that the need for gossip has gone away completely.
Just because you and I don't get any value out of it doesn't mean that nobody else can.
I don't follow a-listers by any stretch, and maybe are why things are much rosier in my part of the world. I seriously miss Nichelle Nichols talking about her garden or her family. Colin Baker and Terry Molloy show the other side of being a sci-fi celebrity - even Doctor Who has to deal with flight delays and wait for the cable installer to show up.
Maybe it's different if you follow Kardashians with social media managers running their Twitter hype machine. But the celebs I've followed are genuinely nice people with interesting lives and passions they want to share.
Just don't tell Colin he should've taken a TARDIS when his rental car is mysteriously cancelled.
A couple days late on this, but to answer your question:
"Celebrities" I follow might be better described as a mix of creatives (musicians, comedians, actors/actresses) and intellectuals (members of the tech, math, and science communities) all with varying degrees of fame and success.
Primarily I follow people I don't know personally on twitter for interesting content. Usually I initially follow them because I am a fan of their work in the medium they are known for.
Some of these people share articles, some hold deep conversations with others on topics I find intriguing, and some just chit chat with followers. There are plenty of people I admire for their work who I do not follow because they just don't post interesting content.
For me, it provides a nice balance on enlightenment and entertainment.
On top of this, I've noticed some celebrities I follow on Twitter using Periscope and advertising it to their feeds, which I wouldn't be surprised to find out is fueled by some form of payment from Twitter.
I can't comment on Peach, but I get the feeling Meerkat's demise was because they were out muscled by Twitter.