It's also a saturated market because of the low barrier of entry, without an advertising budget you are taking a gamble no matter how good the gameplay is.

Even a whale can decide to just spend more money on a game they like more. It's not an endless market for companies to delve into.

What do you mean by whales everywhere?

Low barrier to entry if you're not counting visibility. Yeah you can publish to the stores, but nobody will see it unless you are ordained by the gods at Apple and Google, or you buy eyeballs (and have the capital to do so.)