[userbinator]

Most definitely an artificial limitation. There's nothing about blocking ads that requires a 64-bit CPU.

[usef-]

Apparently the block list is compiled/JITed to native code when loaded for better performance and battery life.

They probably decided it wasn't worth the engineering effort to add a second code generation backend for 32bit phones (which are now three+ generations old and already facing RAM limitations).

[hughes]

What if there are (2^32)+1 ads on the screen!?

[pinewurst]

Just don't look at Yahoo sites then. :)

[jbrooksuk]

Or The Verge!