We must be very careful in optimizing the landing . If we find duplicate content between it and our official website, Google may apply a penalty.
If you do it on the landing page, the effort will not have been worth it and it will not rank well enough to be profitable.
On the other hand, we have the risk that the penalty falls on our official website , with greater consequences since it is on it that we rely mainly for our business.
Obviously we avoid this risk by using original content , which does not entail any penalty or duplicate that of the two sites