I/they (I am no longer with Opera Software) did that for a decade with Opera Mini. It's an interesting engineering challenge. It got us lots of users (0.25B mo

I/they (I am no longer with Opera Software) did that for a decade with Opera Mini. It's an interesting engineering challenge. It got us lots of users (0.25B monthly actives) but they are (relatively speaking) quite poor, so ad revenues aren't as high as you might wish. So you need a lean operation, at least if your operating cost is significant - like transcoding web pages for 1/30th of the global population...