The general number of registered Hong Kong users

Hi, I am a Hong Kong student, recently studying at the market of Hong Kong E-contracts and E-signing Service. It is known that E-signing is a big trend but no certain data showing that how Hong Kong people are getting used to the E-signing service. Can you please provide a general number of how many numbers of users have registered the Fill& Sign app? The data is so important to us as it helps us analyze how Hong Kong is a potential market for E-signing service.