According to the guy who makes the script hook (Alexander Blade) - R* implemented a system which checks for any ASI and scripthook.dlls in the install folder and reports back to them. This was included in patch 350.1.
This is why people using the FOV fix have been banned as if they were using hacks of some sort.
There's meant to be some code which also reports back what mods you're using in singleplayer.
On that note - the new Scripthook will fully prevent you going online with it. In order to go online, you've got to physically move or delete the ASI and scripthook from the install folder.
More reports of bans here:
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