General question - adblock rom usage

As i lost my Archer router with destroyed rom (no flash / jtag possible), where is used both adblock variants for a longer timespan, i would like to know the following.

Which adblock run only in the ram? Mean no logfile to rom, now dns cache to rom, no update to rom. Everything should be run, updated and hold in the ram to get lost by power down.

Rom chips these days are write cycle limited, what may hang around 1000 and up. Assume you you a software, that stores a rom log every second, you know the math......

By default, the list is stored into a memory partition, lost every reboot.
Then, the dns software (unbound, dnsmasq etc) will load it and run into ram.

No flash memory required.