Online CSR Generator?

Question

Encryption

Google on this request gives a lot of links to similar "tools".
For example, here
In response to the filled in required fields and the pressed “Generate CSR” button, we receive a CSR request and a private key .
I have always believed and still believe that the private key should be generated and stored exclusively on the client side.
In what case can the use of such online services be justified?

Answer 1

Obviously, when the privacy of the key does not matter and https on the site is done "to be".

Answer 2

Or testing...