Why are children unsafe online amid rising daily abuse reports?

Children are being left exposed online because reports of suspected sexual exploitation have climbed to as many as 900 a day, according to Graeme Biggar, head of the National Crime Agency, who says the internet is now simply "not safe" for them [1]. He argues this reflects a systemic failure, stating the UK has already let down two generations of teenagers by not putting adequate protections in place [1]. I don't have further coverage explaining the specific mechanisms or platforms driving that rise.