Earlier quoted context omitted.
Blocky/pihole type stuff is what comes to front of mind, which probably fits but add anything else and now you’re hitting the limit.
How many blocklists does one need to have in order for them to use >900 megabytes of RAM?
But pihole asks for a pi with 512gb ram. Add openwrt’s 100mb, now your ram budget for running something else (file server, pairdrop, irc, tailscale, etc) is <400mb. One nodejs app could use all of that.