What spam options and restrictions are there in the business version of Skype?

Question

Skype

Are there any restrictions on sending messages and adding to contacts using the API (which is only available for the business version of Skype)?
Can it be profitable to develop (for people who work with Skype for at least a few hours a day, i.e. who have a business built on this) applications for mass mailing, adding to friends, convenient organization of contacts, message search, etc. only for business -versions? In general, it depends on the restrictions, judging by the API, there are very great opportunities