As well as what Mango said (I watch so many random videos, and I don’t think there’s a way to universally just give each one £1 or so), they are providing Youtube for free. Say what you want about Google, but Youtube does cost them a lot of money, and all things considered it’s a pretty well put together platform.

Yes, I’d like there to be a crowdfunded alternative, and yes I wish they weren’t so megacorpy and just let me download videos (it isn’t costing you anything if I watch a local copy!). But really, they provide a service and £6 or so is what I would consider a fair price.