This has been raised before. but nice to have more people thinking the same way.
Share X will cost Freetrade real money so not the best option. However, offering free Alpha will be marginally cheaper and yet can provide better value. For example, Yearly Alpha (£100) will most certainly cost Freetrade less than £50 of share X. Hence as a customer, you would be better off with Alpha and it will be significantly cheaper for Freetrade to provide.