This is a mysterious choice by WotC.

Apple releases all manner of powerful APIs for their developers to use for their App Store which has created a billion dollar business for them.

In a similar way, you would think WotC would release all manner of useful digital resources to power the value of their online module store.

We expected this to contain all the beasts into which a druid could wildshape.

Instead here are the creatures: Girallon, Kruthik, Krenshar, Inferno Spider, Howler Wasp, Spark Lasher, Dread Ram, Yeth Hound, Frost Worm, Frost Salamander, Mad Slasher, Arrowhawk, Shocker Lizard, Yrthak, Harpoon Spider, Giant Strider.

Nothing signficant from the Monster Manual.

It is good it is free as this will rarely be used by any module author.

It would be great to see WotC use the playbook that Apple, Google, Amazon and others have used to build their businesses: release great digital assets for your community of content developers.