As a free RealTimes user you will get 2 GB of Cloud space. After reviewing your account, I see you haven't used any of your Cloud space (uploading videos or pictures to Cloud). Therefore, due to inactivity of Cloud usage you received such email from us.
If you would like to continue using your RealTimes free account, try uploading videos to Cloud or try sharing some videos with your friends and family.
To upload videos to Cloud, refer this article: https://customer.real.com/hc/en-us/articles/204043153
To share videos or photos using RealTimes, refer this article: https://customer.real.com/hc/en-us/articles/204043123