While I don't live in the UK, I know how I'd feel about such things if they were happening to me.

To begin, it's a private company, and they're allowed to censor whatever they want from their customer forum. Keep in mind, they have to worry about marketing and PR as much as any other private company. Generally, you have options to go to another company if you don't like how they operate. If not, find another place to discuss your beef.

Second, advertising is a means to profit for most any media. We're going through a transition and *everyone* needs to adapt, equally. Many people pay for cable or satellite TV. There are free programs, and paid programs. Everything needs to be funded, somewhere. Let's all try to be reasonable and work this out. There's a learning process to be had, but it'll get sorted out.