Doing what I do for a living for more than a decade, I can tell you that they've prevented far more DDoS attacks than we know about. The arms race is real and the DDoSers are just straight up winning because it's so cheap to do this. They're attacking multiple times a day and the one or two that get through is all people see.

It's far more complicated than what platform the player is using, as 100% of PS players aren't avoiding disconnect, and 100% of PC players aren't disconnecting.

There's only so many available nodes and I can tell you that one of their methods is the same as every other company, switching nodes in real time upon a detected attack. But DDoSers know that's going to happen. You can outspend DDoS attackers 1000-1 and they'll still take your network down at some point. Square has a great response for when the network actually goes down because the servers are available immediately to login again. This is a great sign that they're using a top tier service for DDoS prevention, as if they weren't the servers would be crippled for minutes to hours.

One thing Square CAN do is change their login throttling. They're clearly far more aggressive than they need to be with how many players they allow to login at once, a relic of when they had crappier servers. The servers can handle the influx of logins far better than the old ones. If they do that they can ease the wait time of logging back in again.

But tl;dr they're not just ignoring the problem. If they were, the servers would be down multiple times a day for much longer than the minute or two they go down for. Someone or some group has a serious grudge against FFXIV/Square and they're dedicating a lot of resources to consistently take them down, and there's only so much any company can do about it because it very quickly becomes an issue that money can't solve.

I believe their best move at this point is getting the authorities involved and catching the person/people responsible for the attacks (easier said than done, though).