There have been calls off and on for years for SE to give us better tools. The best they did was to bury an option for reporting RMT in the menus. The untargatable bit you mention is a known issue... seems like SE can't or won't fix it. Only they know why.
They DO ban bots- usually in waves, with casualties numbering in the thousands- but never enough to make it seem like they're actually doing something since there's so damn many of them and they're so cheap and easy to set up. It's the scourge of every semi-popular MMO ever. XIV is less bot-infested than other MMOs I've tried due to the paywall but we will never be free of them entirely... botting in the second-most popular MMO behind WoW is a lucrative enterprise.
Also, generally speaking SE has a more laissez-faire approach to what they see as player or personal problems than some other games do. If they can't tell for sure what you're reporting is a bot (0 room for doubt after investigation with their own internal tools) then the bot will roam free. That's probably why you see a lot of them... people will legitimately play, then start botting once they're done having fun so they can make some money on the side. I think SE could be a bit more loose with their definitions but we don't know what their internal standards are so it's hard to say. They're not open about what they do or how they do it like Western companies you sometimes see. Kinda OT... I left LoL for many reasons but I still fondly remember the candor of the employees that communicated with the playerbase. Pendragon himself talked to me and asked me do a beta preview of the forums that are in use today because I gave suggestions to improve the experience so I didn't risk getting a migraine when visiting. Stuff like that matters. SE is very, very far removed from us compared to that level of interaction. It's probably a lot of the reason we feel they do nothing even when they give regular reports on how many accounts have been suspended or banned for botting/RMT.