I appreciate that you're probably busy with Fallout 4 and Doom, but some Fallout Shelter love would be appreciated, especially given how broken the survivor Mode is at the moment.
Money grab? Its free to play, and you don't have to buy stuff in it either. You can, but that is what we call choice.
They didn't release it to capitalize on Fallout 4 - they released it to advertise and build hype for Fallout 4, and to tease some of the new features of Fallout 4. I don't think they ever intended for Shelter to be used as an entry point into the mobile games market, and they never expected to make a huge amount of money off it. They were probably just happy to recover the costs that went into developing it. Now that Fallout 4 has been released, Shelter no longer has any purpose for them, so they'll just let it die.
It's been pretty busy, but you'll see new changes to the game today with our 1.3 update. As we have new details and future updates, we'll keep you posted.