If you want mech arena to change, write bad reviews
I have cast doubt on this approach but that seems to be the best way to force a change available to f2p at least is reviews. This works well for paying players too because it makes it hard for them to draw in more spenders.
I cast doubt on this approach before because historically I have seen ratings paused if a mass amount of negative reviews came in these were not botted tho enough players were genuinely upset by the change so they had their voices silenced. As well I have had my own reviews following all review guidelines removed. So it's not beneath payrium to censor players. But call them out and it stops and that's when you again express your discontent.