Mobilecoin (Foundation) is a technological, ethical, and legal tour de force. I recommend you read their FAQ, but, to me anyway, it is obvious why Signal/Moxie needed to create a new coin (tl;dr: It needed to be a private venmo-like experience). To prevent conflicts of interest, a new org was created. Hence Mobilecoin, not SignalCoin. A few highlights:
Technological:
* First Oblivious RAM implementation, "fog", so that transacting parties cannot be revealed
* Their Rust codebase is really nice
* Instant transfers with little computing power (CO2 emissions)
Ethical:
* Moxie and Josh Goldbard hold no MOB, along with the employees. The Mobilecoin foundation has some awesome partners, e.g. the Long Now Foundation.
* Mining is not ethical, it pollutes the planet and is just bad. The only alternative is a "pre-mine" given to an independent org, ie Mobilecoin Foundation
Legal:
* The US's laws are not clear on what is allowable with privacy coins, so Mobilecoin has played it conservatively by saying US residents can't own the coins.
In summary, the critiques of Mobilecoin (in any of its incarnations, foundation, moxie, etc.) are assuming the agents involved have a financial interest in MOB being expensive -- I contend that is not the case. Please show your evidence.
PS. I am assuming good faith and honesty in statements, eg "Marlinspike notes, however, that neither he nor Signal own any MobileCoins." https://www.wired.com/story/signal-mobilecoin-payments-messa...
PPS. Some direct responses:
>Let's assume that they integrated with Bitcoin or Litecoin or some "mainstream" CC, would it still be a good idea?
No, not private. Also slow. Also pollutes planet. Monero is close on the privacy front, but takes 3 minutes to send (very stressful). It's possible a coin with the proper attributes could be made on stellar, but that raises questions towards ownership of Lumens (and pumping them) and their stellar reimplementation in Rust is likely more secure.
>Niche coin
nit: MOB has a top 15 market cap with 250m coins in distribution. Though I would hesitate to compare to other cryptocurrencies which are almost entirely scammy, polluting garbage.