Sadly, with a seven year old game it's entirely possible that the only players who have stuck with the game this far are the people who cheat. And if they're your player base, and especially if they willing spend money in the store, then you have absolutely no incentive to develop expensive, state of the art anticheat (especially when the cheat industry will beat it inside a week) and you equally have no incentive to put a stop to smurfing. Which, imo, is just as insidious a form of cheating as an aimbot subscription.
And this is supposing that Respawn could develop a space-age anticheat if only they were motivated to do it. I'm not convinced they could, or that they could even buy it off the shelf from a third party... because what I'm absolutely convinced of is EA's determination to spend zero money on these problems no matter how bad they get. The CFO of EA is the kind of person who would look at their own injured dog, do the quick math in their head, and then put the dog down if it was even a few pennies cheaper than treatment. Because every dime you spend on treatment is a dime you can't use to remunerate upper management or shareholders. And those stakeholders are the reason the company exists. Games are just the grift they use to get there. Profit first. Product a distant second. Customers a very distant third. When they can be bothered to remember that we're the ones who pay the bills. And sometimes not even then.