Are "pixel" traps a thing?

Hey folks,

I've been looking into some references for screen-use typefaces and to my astonishment found some humanist sans with "ink" traps - although those fonts seem to be explicitly designed for screen use. For example PT Sans, or Open Sans.

Has pixel and subpixel antialiasing come to a point where this is a viable option for screen fonts, or are those just exotic exceptions (although those examples are quite mainstream, in terms of web fonts in the wild)? Would those "pixel" traps behave differently from traditional ink traps, or is it a one to one transfer of the same principle?

Curious to hear your thoughts. And I'd happily study more references with similar features, if any come to your mind.

Thanks,
Johannes