I believe two wallets. Andreas' Android Bitcoin wallet and BRD are significant users of node_bloom.

Privacy is a matter of individual choice in the current protocol. Why not let people provide this network service? I don't see why it should be end-of-life if it provides value.

I believe there's a network security obtained by having a large quantity of people following the Bitcoin headers based on longest weighted chain. As a means of nullifying potential miner initiated hard forks (like S2X).

Respectfully,

Peter