"It's not the platform holder's job to make [third party games] successful." - Robot Entertaiment CEO

[kitler53]

Conina said:

It's also not the third parties' job to make a platform successful (by supporting it with games). Especially if the conditions on other platforms are better (better software tools, less (expensive) optimization needed thanks to powerful hardware, more people that buy these games/genres...)

this.

and being multi-plat has extra costs.  a 3rd party like EA will be more profitable if it has 10 million customers on 1 device than 1 million customers each on 10 devices.