You will be surprised there are some on the leaderboards now who have spent thousands of plat to get there.
Some have no or little deaths too.

Playing the game you know who boosts and who doesn't, you will see boosters in locked games alone for pve. As well as the ones who farm for gold using bot programs (this gets you banned).
Those who boost for PVP and CTF, when you fight against them, again you can tell.

But boosting is not a something that will get one banned, and it still takes time and effort to boost to get on the leaderboard. Still it is not respected by most.

What Ruby is doing gains respect.