AWS has some good resources about multi-tenancy and tenant isolation. What to consider, different possible architectures, etc.
I realize you are asking about multi-tenancy vs single-tenancy, and these resources are more about different types of multi-tenancy, but they still should offer lots for you to consider. Many of the concepts should be applicable even if you are not building on AWS.
For further actions, you may consider blocking this person and/or reporting abuse
We're a place where coders share, stay up-to-date and grow their careers.
AWS has some good resources about multi-tenancy and tenant isolation. What to consider, different possible architectures, etc.
I realize you are asking about multi-tenancy vs single-tenancy, and these resources are more about different types of multi-tenancy, but they still should offer lots for you to consider. Many of the concepts should be applicable even if you are not building on AWS.