If you read the Medium article, at the bottom under the list of what’s coming they have written:
" 2020: Acceleration
The big one. A juggernaut representing the size of Freetrade’s ambitions, our Invest Platform is the single most significant piece of engineering work we’ve undertaken.
Phase one will see all customers migrate onto the Invest Platform in December, enabling us to release features fractional shares, thousands of US stocks, and more early 2020."
So looks like fractional shares and more stocks are on the way.