The real challenge is network effects. You can't fight it. If the top dog has a considerable percentage of the population trapped in their platform, then it is already too late.

The only way to get people off the platform is to literally get hired and "trip over the cord" on purpose.. which at this point is likely going to involve very elevated permissions, and a really high chance of jail time.

I'm starting to imagine that diferent currencies, like money are converging with their platforms

each platform having your its own currency? well that's simply one nation. a federal government, registered at the UN. this translates the UN into Etherum, register your currency and be a part of what exactly?

I have to admit, I've always wondered what would happen if say, the old Twitter staff had just completely wiped the servers before they left. Would they even try to bring the site back, or just write off the whole company?

But seriously, a network effect isn't necessarily the end of the industry. Lots of sites and services make major screw ups that drive away a lot of users to an alternative in some way or another, or outcompete a huge incumbent. Like what happened with Digg and Reddit.