That's a great list. Although it highlights how few services have adopted the API functionality for GMB posts.
I must say, the inclusion of PatientPop is a bit curious as it's for a specific vertical, but nevertheless it would apply to those in the patient services niche. You might want to update the pricing to at least give the reader a ballpark figure on costs, like "starts at $550/month" Did the author(s) have some sort of relationship with them?
Also note that your pricing for Sendible is incorrect. For as little as $29/month you could post to up to 12 GMB listings (divided amongst up to 4 different Google accounts I believe.) (But then you couldn't post to any other social accounts if you used up all 12 for GMB). Even if you had 12 GMB locations you can easily use Sendible for GMB and another service for all your other social accounts for less than $70/month total which for the SMB is a significant savings over $199/month.
In my opinion many of these services are overpriced and are banking off the fact the average SMB client isn't that knowledgeable regarding the entire choice of services out there. But that's nothing new in the world of capitalism.
It's still surprising brands like these still yet to have the functionality:
Hootsuite
Social Pilot
Buffer
Sprout Social
etc etc
