I did that for my business (a bakery). Spent ages on it, put in all the details I could think of. At the end of the process there seemed to be a requirement to send it you review so I did that. This was several months ago (probably six months), and it's never showed up.
I'm busy, and I have a thousand more useful things to do for my business. I'm very unlikely to try again.
On the other hand, if the process had been easier I'd probably have then gone on to adding other businesses in the area.
The actual business is listed, but with a slightly wrong name. But I can put that exact slightly wrong name into the search on openstreetmap.org right now and there's zero results.
Then I can manually zoom to the location (which is correct), see my business, tap on it... And nothing. It doesn't open. So given all of this, why would I bother with openstreetmaps as a business owner?