There are games where botting is possible, others where it isn't, or at least botting wouldn't bring you any profit big enough to have spare gold to sell.
Let me give you as example the MMO Blade and Soul".
The game was designed in a way you couldn't bot for junk items, because the values were too small while selling to NPC shops, and valuable items dropped only in raids.
So both whales and gold sellers were making bank on selling raid loot spots, and the raid loot itself.
Therefore, there was no botting possible in said game.
I don't know of anyone who got banned for buying gold, which is something I did myself from various websites.
In other old school MMOs such as Anarchy Online, the method was similar. You couldn't bot anything since making money that way was impossible. So there were groups of Raid loot farmers (AI raid armor components), larger raid item loot rights, etc.
But in games such as Diablo Immortal, where you have people selling speed hack, damage hack, invulnerability hack, etc., I'm 100% sure the gold is hacked, not botted, since if they can hack the game for a speed boost, they can do the same for duping or spawning items, platinum, etc.
So, I don't think it's fair to ban the term itself, since sometimes it's a 100% legitimate claim.
Also, whether you buy hand farmed gold, botted gold or hacked gold, the risk of getting banned is the same, and it depends on whether the company that owns your game hired people specialized in tracking in game transactions, the origin of the gold you have in your inventory and so on.
So the better option would be to warn the buyer of this and the possibility of getting banned after purchasing gold.
You should train your buyers to "wash" the gold by spending it on the market instantly, so they lose trace of it.
Even if you'd get banned, you could still message the support saying you did nothing wrong, and that some random guy gave you gold. You thought he wanted to quit the game, so did not ask any questions, I mean why would you.
They can't verify if this information is true or false.
They can't verify for sure that you have actually purchased the gold, unless you're dumb and you message the seller in game saying "Hey, where is the gold I bought from you?".
So let's not do "woke" mistakes here, and instead of banning something that might be legitimate (innocent until proven guilty I think it's the term), allow sellers to keep using the term until proven otherwise.
IF they claim their gold is hand farmed, it is their responsibility to upkeep the claim.
If someone gets banned for buying their "hand farmed gold" for botting, the sellers should be permanently banned on this website.
Getting verified on a different name, re-building all the feedback, etc. would damage their sales hard enough to make them stop making false claims in the future.
That's my opinion, anyway.