> And I fail to see why anyone would use this, you need high speed internet capable of streaming 4k for one and if you have access to that, then chances are you also have access to a sufficiently powerful computer capable of running chrome locally

That's a weird assumption. Where I'm from gigabit (or at the very least 100mbit) fibre is the norm, which means fast 4K-ready internet cuts across virtually every socioeconomic demographic.