That's not what the GP is saying. They're saying that only Facebook and the like have the resources to catch fraud, and smaller players won't. Yes, it's harder, but that hardness is almost an irrelevance to Facebook and other FAANG-alikes, whereas it could be much more of a problem for smaller businesses who will struggle to bear the costs both of fraud, and to develop anti-fraud solutions (or pay for anti-fraud services).
Maybe that opens up some opportunities as well, but that's not necessarily particularly appetising for businesses that aren't focussed around those areas of opportunity.
Maybe that opens up some opportunities as well, but that's not necessarily particularly appetising for businesses that aren't focussed around those areas of opportunity.