But you just assumed that someone who uses these low end devices has heard of a raspberry pi, can afford one and even has wired internet to plug it into.
I was responding to someone with a recent example of a slower Android phone. I know many Linux and Android users who already have Raspberry Pi’s and similar devices they could use to set up a pihole. People who go down the “fully free” Linux path or even are using more experimental hardware have the same issues.