[selfhoster11]

They don't have to be a good steward. They can simply be a good-enough steward until they kill off all remaining competition (of which - hey, only Firefox is left!), then they can coast on minimum effort for as long as it takes for the web to die off and for the app-ification process of everything to complete. Then they can move on to greater, bolder things.

[kitsunesoba]

Exactly. Once there’s nothing but Chrome, there can never be another significant challenger because the barrier to entry is too high.

Additionally, even in the situation that Google is a “good steward”, their total dominance means that there is no room for meaningfully different visions of the web to compete, which is very bad.