Once again excellent advice.
Take care when mentioning a company by name though...
I am sure the companies referred to in your post are doing nothing illegal (cough) so people should just be aware of their (the company's) policies.
You are right to warn us. Even people that one would regard as 'intelligent', have been caught out by unwittingly singing up to unwanted subscription services.
Here is a link for others, to a body trying to curb the flow of telephone related "misbehaviour" click here