Criminal "protection" "taxes" were common 15 years ago and even then it was nothing like "20%" for everybody, it varied greatly from place to place and from business to business and depended on who you know and where are you from.
Small-to-medium businesses are free from anything like that by now AFAIK.
To conduct a "serious" business in most fields you still have to know the right people though, if you don't want it to be taken from you.