i mean, looking at the history it makes sense that not many do anymore. webkit is apple's fork of KHTML, the KDE project's reimplementation of gecko, done because gecko is so goddamn hard to embed. once apple open sourced it, everyone started using it because, again, gecko is so hard to use. the biggest browser to use webkit quickly became chrome. then when chrome needed a different feature set than safari, they diverged and chrome's webkit became blink. because every third-party browser wanted to be compatible with the largest browser, they also switched. vivaldi was one of the last to switch i think. brave came into being after the fork so they started on blink.