Yeah I think Google is pretty hard to beat for anyone who only cares about cheap storage, unfortunately. One argument I have for that crowd is that there's nothing stopping Google from coming seeking rent in the future (like they're currently doing with Photos), once they successfully kill off all viable competition by offering their products at a loss, which they can afford to do but a lot of companies who only do one thing (like e.g. email) can't.

But yeah I also don't think Nextcloud or other alternatives will really take over unless security/privacy/ethics become a higher priority than cost for most people, which seems unlikely to me.

Edit: Typo (of -> off)