WebKit is established and controlled by the richest company of the world. Most websites make sure they work on it because hardware (exclusively) running it are widespread. Why should someone interested in new players care? Anyone knowing about Servo and Ladybird has most likely heard of it anyway.
(agreed, it is a credible alternative to Blink's dominance)
It is good to have competitions in Ecmascript landscape, even though it is currently a duopoly, but with introduction of AWS LLRT, and QuickJS, maybe small player can even have a say so in this. It would be good the big corp comply to the Ecmascript and Web API standard.
(agreed, it is a credible alternative to Blink's dominance)