You're on a hiding to nothing here, except perhaps an injunction.
Delay Repay Sniper, Rail Guard etc and plenty of others were shut down, mainly for facilitating fraud. They all were not conducting reasonable due diligence when it came to their customers, and the vast majority of claims were unsurprisingly, fraudulent. If you want to act as the professional agent or intermediary for a passenger, to claim money on their behalf, it is right that the industry expects you to conduct Know Your Customer checks, perform basic due diligence as to the merits / validity of a claim, and have robust procedures in place in terms of managing the payment and payment details. You are going to have to ensure that money is paid directly to customers, and not to you, otherwise you are then encountering issues around client money suspense accounts, money laundering etc.
Most TOCs also have rules in place that block persistent IP addresses, Device fingerprints, MAC addresses as well as extensive data matching in the background.
I suspect now, that the ORR would also take a dim view of any organisation seeking to take a facilitation fee or subscription for claiming compensation, and may well use consumer protection legislation to apply pressure.