TD Ameritrade has charged my a $15 daily fee to buy and sell RLFTF (they have only charged me the $15 fee once per day no matter how many trades I do in or out), plus their normal 6.95 to buy and 6.95 plus commission to sell (usually just a couple bucks for my trades, and some of my sell orders had no commission tacked on (I almost remember them saying they were waiving them for a certain period of time?
Like a promotion during Covid back in July?)).
These fees are really insignificant, unless you're trying to buy, in really really small buckets.