Worse, even the best NLP models at the moment are clever hanses. Also, the huggingface "write with transformer" has far more hyperparamaters to play with which make it far far far better than this website.
I'm sorry to have to echo the other comments or come off as overly critical, but this service blows. I see zero reasons why I or anyone else would want to use it - especially since your competing against the very best NLP minds.
Next time, try to use models which might actually be effective. Salesforce released one called "CTRL" which if you had productized might have actually given you what you want (effective controllable text generation)