Sounds like you are one of the unlucky few who are being forced to accept guests without any conversation with them.
To be clear, it 's a revenue generator for AirBnB as it allows impulse buys and means that guests don't need to wait for approval from the host.
However, from the host perspective it fundamentally undermines some of what AirBnB was set up to do - and it leave you open to significant risk and lack of any interaction as to who is staying in your home (particularly where you are sharing a flat etc)
Will be interesting to see how that works out in due course. In the meantime good luck..