ARR and heavensward there were bots that would spam dungeons as black mages to make gil. Sometimes they'd cluster farm in north shroud, south shroud and corthas. There were gatherer bots back then but they weren't very prevalent. But it only really got bad in stormblood.
In stormblood I don't know what happened but suddenly botting became very wide spread. It sucks because I used to be a high end crafter. I used to know all my fellow crafters and we'd compete against each other while making money. We had a community kinda. It's impossible to complete on the market board these days. Players will say "go to a different market!" But I shouldn't have to branch out of end game markets because of bots. There's something inherently wrong with that. Literally it's only the first week of new patches where you can make money on end game items before the bots get updated and go back to their nonsense.
Same with gathering. I know lots of players who used to gather to make money. Fishing specifically because it was a pain so it was the most lucrative. But gathering mats are chump change these days because of bots so gatherer mains make pathetic amounts of money.
It's actually really embarrassing that the situation is what it is. People on these forums for some reason like to diminish bots or advocate for them but there's tons of players who play this game for different reasons. I do a bit of everything and I enjoy ultimate so although it sucks to not be able to play the markert board like I used to I have other avenues of content to do. I have friends who litterly only gather abd craft. Almost all of my friends who rarely participated in battle content have quit since then because the situation has deteriorated so much. You just can't compete against market board bots.
Luckily for me I cashed out on heavensward relics so I don't have to worry about gil so much but if I was new and trying to make gil these days.....lol good luck to you it looks very hard.