Why don't relayers bundle transactions to save gas?

Apologies if I’m missing something, but when I go to withdrawal and send my transaction to a relayer, why can’t the relayer just wait for a day or so and then process all the txs for that day at once, and we all split the gas costs? This would lessen the cost of gas we all have to pay. What do y’all think?

It really wouldn’t save that much gas. Most of the gas costs are associated with submitting the withdraw proof. Each withdraw has its own proof. Bundling txs would still require the same number of proofs