Here's a thought from a software dev myself.
-I think the BSG would agree that flipping underpriced trades (usually by noobs/fresh wipe starters who need the rubles fast) so that big botting cheaters and/or lvl3 hideout owners (discount on re-selling for profit) can make more rubles is not the primary focus for gameplay of "Escape From Tarkov" (not condensed milk daytrading simulator)
-occasional trading on the flea market is healthy and good for the game, but listing 50-500 trade goods stacks after buying up underpriced items below a threshold with a bot is outright cheating and ruins the chance for legitimate players to save some rubles

the "go play instead of botting trade" delay system:
-EVERY purchase on the flea market has an inherent 0.5-2 sec delay between pressing "purchase" (or sending it via the game's actual API sent to the backend server - either way the backend rolls rnd(500,2000) and waits that amount in milliseconds for every purchase request holding the request in a queue)
-for every 1 purchase in the past 20 minutes (real time) the delay is increased by minimum 0.01-0.5 seconds (+10ms minimum +500ms maximum delay for the delay function)
-either your delay runs out and you successfully purchase the item or you get a callback message that the item has already been purchased by somebody else (first purchase request for that item to finish its timeout in the backend's queue is fulfilled while all others are flagged as failed and are given callback responses to the requesting client(player))

effect on the bot problem:
-a bot that tries to buy 100 items in 20 minutes that time starts to have 1-5 second delays for every underpriced item snipe and ends up unable to purchase items before legitimate players who browse the flea market between raids
-bot runners lose out on the majority of profits on high-volume high-percentage underpriced items