You may be right, and it would make sense, was just poking around reading about Ram Scrapers effect on Point of Sale systems
A Ram Scraper wouldn't be a problem for a bitcoin based Point Of Sale (POS) system, since the POS system shouldn't have any of the private keys. It would be a problem for an individual consumer if they had a Ram Scraper running on whatever equipment they were using to send the bitcoins, but that wouldn't effect the rest of the consumers that were paying at that same POS system. It would be up to the consumer to protect their own funds (through muti-sig, or offline transactions, or by simply managing risk by avoiding storing large amounts of bitcoin on vulnerable systems).
POS systems are a target for credit card numbers because the POS system gets to access the number of every card that is used to pay at that system. With a large scale merchant, that means that an attacker can gain thousands or even millions of credit card numbers by targeting a single POS system.
The threat model doesn't work as well for bitcoin transactions, since the attacker would need to target the specific wallet (or wallets) that they want access to.