When fractional share buys are implemented, and US shares are available, and the stock universe if very large, it would, in theory, be possible to do what an index-tracking ETF does yourself.
Just look up the current proportions of what’s in the index every day and buy and sell accordingly.
You’d save on OFC and your performance would depend on your tracking error. (Do the iShares of this world have any significant advantage in being able to have a lower tracking error?)
If everyone did this, would that be damaging in any way to freetrade (having to do so many free buys and sells)?
Would freetrade ever be interested in getting in to the game themselves, offering ultra-low OFC tracking funds?