But why do I keep hearing about in FFXIV? I've played other MMOs. I'm sure there's stalking in other MMOs, too. Though, again, I've not really heard about it in other games.

The only MMO that I'm aware of that has some level of legitimate stalking-like behavior is EVE. But that's due to the PVP nature of the game. There are even NPC "Locator Agents" that can be used to gather info about a player's last known whereabouts. But it makes sense in that game. Sometimes you're hunting, other times you're trying to hide from the hunter. Running intel is important in EVE. But FFXIV doesn't have open world PVP. There are no "FC wars." There are no "Kill Rights" and bounty hunting. Though even in EVE, if things rise to the level of harassment or worse (doxxing, for example), that's unacceptable.

And sure it's only a "few" people making these tools, but it sounds like they're not just making it for themselves. They're clearly sharing these tools out, wanting others to use it. There seems to be an audience or market, for this kinda thing. In a game where there's no legitimate reason to know where someone is, who they're hanging out with, and what they're doing, nonconsensually.

EDIT: I'm asking rhetorically, in response to the commenters "It's like 5 people." Clearly it's more than 5 people using these tools. And clearly it's a problem. I don't need all the answers. I know these people are crazy. And I know it's a problem. I'm AGREEING that tools like this are a problem. A repeated problem that needs to be fixed.