I find this quite tedious, to be honest - 'as long as they're doing it for charity, it doesn't matter if the song is awful'. No, it does, that's not an excuse. I think I'm just a bit sick of charity records after this year, and they often play on your emotional vulnerability in order to sell more copies. I just hope he doesn't do 'Sausage Roll With It' or whatever next year, but he probably will. Even the Spice Girls could only manage three Christmas number ones.
And about the whole 'sticking it to the music industry' thing - well, this is just as boring as when all the X Factor winners would get to number one, only the songs are somehow less funny than they were back then.
The entire chart needs a rethink to be honest - streams have pretty much killed it dead, to the point where rules like ACR (Accelerated Chart Ratio, ie. the Sheeran rule) are mandated in order to make it more exciting.
I can completely understand you not enjoying the charity singles themselves (I also don't tend to like them) but I really don't understand in this day and age why you'd object so much to them doing well. You can pull up literally any song you fancy* on Spotify, YouTube, iTunes and others, and not necessarily need to pay for the privilege. You can totally ignore the chart if you fancy.
I've never quite got the way some treat the singles chart as sacred. It is what it is – a way to see what's trending, popular and indeed the opposite. It's really just a bit of fun, ultimately. We all know it's not perfect – especially these days – as a measure of those things, but by and large it does actually reflect what's being talked about and played by people. The chart has never claimed to be a measure of quality, sincerity, musical competence or any of those things. It's just… what people are listening to. If the intention of those people is to support a charity, then great. As others have said, they need that support more than ever.
To reassure you, we are not as far as I know sending a copy of the UK top 40 singles to a distant alien civilisation every week and describing it as 'the best music we have to offer'. On the other hand, it is treated with respect in my view. Give a listen to Scott Mills on Radio 1 each Friday – he clearly cares about the chart and knows about his stuff, but also enjoys it. I think that's probably where the balance should lie.
*not quite literally any