This is incorrect advice that could get someone convicted.
A licence is required if you watch live TV on any channel.
A licence is required if you watch live TV on any channel.
https://www.tvlicensing.co.uk/faqs/FAQ104
But indeed, watching any channel on TV (not just the BBC) requires a licence.
If you’re watching live TV, you need to be covered by a TV Licence:
a. if you’re watching on TV or on an online TV service
b. for all channels, not just the BBC
c. ...I would think that Netflix and Amazon are considered on demand services.
iPlayer isn't either, but they've recently put in an exception for that.
https://www.tvlicensing.co.uk/faqs/FAQ95 is pretty clear that I have to pay.
Why, ethically, should I be obliged to pay TVLA (and therefor the BBC) for something they didn't create or facilitate?
That is incorrect. It doesn't matter whether the content was paid for by the licence or not. If you are watching live TV, you need a licence.