I wouldn't write them off yet - but if their funding dries up and there's no more money to support their spending habits this will seem like a great prediction. Giving away stuff that's usually expensive for free is a great way to get numbers - It worked for facebook, uber and many others but it doesn't mean you'll become a profitable company.
Anyone with enough money can buy users - example they could start an airline tomorrow where flights are free and get a lot of riders - but if they don't figure out how to monetize, it'll be a very short experiment.
Anyone with enough money can buy users - example they could start an airline tomorrow where flights are free and get a lot of riders - but if they don't figure out how to monetize, it'll be a very short experiment.