security of Zoho site

security of Zoho site

2 days ago I used zoho writer to make a personal document using my full name which I have never done on any computer before. Today I received spam telling me I've won a lottery on the internet. This of course is a fraudulent scam but it concerns me that someone was able to access my personal document so fast through this site even when I have a secure procedure such as HTTPS encrypted setting activated.