https://github.com/magesuite/magesuite-success-page-registration
This module adds a registration form on the checkout success page for guest users. The form is already populated with data provided by the user in the checkout.
Installation
This module is optional
composer require "creativestyle/magesuite-success-page-registration" ^2.0.0
Admin settings
Stores -> Configuration -> Magesuite -> Success page -> Registration form
Adds registration form to Success Page. Default value: yes
Frontend
The registration form is the same form as displayed on the register page. Fields that are already filled (f.e. name) are hidden by CSS.
Magento ReCaptcha block is added to the form