If you can afford to cut multi-million dollar checks for a fraud/abuse prevention service, then you can also afford to retain a legal team who will recoup your

If you can afford to cut multi-million dollar checks for a fraud/abuse prevention service, then you can also afford to retain a legal team who will recoup your losses and then some when those contracts are broken. A temporary production outage due to a rare situation is far preferable to being at the perpetual mercy of hackers constantly pwning whatever half-baked homegrown security system you forced your engineers to implement with inadequate support & resources. Real businesses don't operate on "I guess" solutions and they don't just fork over huge chunks of cash willy-nilly without doing at least some cost-benefit analysis and making sure they're protected in case of contract breach.