lmao for those of you who are complaining about this, you probably don't actually play Frontlines all that often. Although I've experienced players who appear to be using "hacks" like the OP is describing, or something to boost their jumping speed / distance, none of these players are ever very good. I recommend using macros to place numbers above particularly annoying enemies and also see who they are. For example:

/macrolock
/mk attack1 <t>
/echo Attack 1 - <targetjob> (<t>)

Although you can typically see only the class of enemy players in Frontlines and Rival Wings, the above macro will allow you to see who those people actually are. Then, after the match, look at their stats: How much damage did they do? How many enemies did they kill? How much did they heal? How many objectives did they do? Unsurprisingly, people who are obviously using scripts and bots are generally nowhere near the top of the charts after a match, so you really don't have much to worry about. Nine out of ten times, the reason your team doesn't win is because they're feeding or ignoring objectives, not because of "hackers."

I still think one of the biggest issues with the PvP community is not "hackers," but rather how unwelcoming many of well established players are to newcomers - if you don't acknowledge / engage with them and let them know how cool they are, many of them will accuse you of being a cheater and go out of their way to grief you. If you just ignore the sweaty kids and keep your head down, PvP in this game can actually be pretty fun, even if you're queuing solo (which I do most of the time, even though it can be painful when you get paired up against coordinated premades who instantly get BH5 off of baddies and then proceed to steamroll everyone).