I'm a media relations specialist and I've worked as a press officer in the criminal justice system so I'll share my professional perspective on this.
It's worth noting that although charges have been brought, the actual trial won't start for at least a year, so all reporting at this stage has to be very, very careful and limited to certain information, to avoid prejudicing the trial. What's been reported so far is literally all that can be said at this stage - this is the very earliest point in the proceedings and they can't really report anything more now until the trial starts, which will be September 2023 at the earliest according to the article. It's when the trial starts that the story becomes bigger news. Technically, that is when it becomes 'in the public interest' to cover it more extensively.
I suspect that when the case actually comes to court next year, it will be covered a lot more extensively in all the press, and even more so of course if the defendants are found guilty.
I understand your point because it's an extremely shocking and lurid set of allegations, but it has been reported factually in all the major news outlets and with my professional hat on, I'd it's had pretty much the amount and type of coverage that I would expect at this very early stage in the proceedings. I think there will definitely be a lot more when there's more that the press can actually say.