Many of them are not accurate either. Many contain misleading information and/or gloss over the hard bits.
There is a hilarious one where some American shows everyone how to remove the cleaner head by prying it with a huge lever. You can hear the plastic cracking as he does it.
Most are created only to sell the parts. They care not if some bloke ends up with a machine in bits he cant put back together again.
We get many 'Youtube machines' (that's a machine brought in in a bin bag in bits)
- ones where some guy took it to bits after watching Youtube stuff and cant get it back together again.
I did always like the old Dyson Medic
site though. It was handy in the early days.