It is not fair to say it is more transmissible, we don't know that yet.
For instance, most the cases are in an area with low vaccination rates and also relatively low numbers of delta cases, so there wasn't much covid around for it to "outcompete".
It's very unlikely that any variant totally evade the vaccines and the latest science on this variant is very encouraging that the vaccine is still extremely effective against severe disease. Which isn't surprising because the vaccine is polyclonal.
For instance, most the cases are in an area with low vaccination rates and also relatively low numbers of delta cases, so there wasn't much covid around for it to "outcompete".
It's very unlikely that any variant totally evade the vaccines and the latest science on this variant is very encouraging that the vaccine is still extremely effective against severe disease. Which isn't surprising because the vaccine is polyclonal.