I think the word “unique” in the description is unnecessary. You can absolutely have a non-unique calling. Depending on how you categorise it though it may or may not sound unique.

It’s like the are we a monopoly question:

Google: we are not a monopoly in the advertising business. We have so much competition from billboards, tv ads, newspaper ads and other websites with their own ads.

Local restaurant: we totally are a monopoly. We are the only Italian-Korean fusion restaurant open after 11pm in this small town!