I'd imagine they see a new platform/user base they can dump a ton of money into and slowly take for themselves. At very least, another well of user data. If their app was significantly better than the smaller dev's, would you mind if there was an ad or two?
I am hoping we keep their grubby hands off, so there is no chance of them destroying this growing platform.
Have you looked up how much a Billion dollars really is? Billionaires are not living paycheck to paycheck. They could do so fucking much with their money and resources, but they choose to invest in shitty submarines and privatized space travel. I am all for pursuing advances in tech and life, but let's solve the issues with earth first like world hunger, homelessness, and climate change.