Microsoft had essentially left it for dead shortly after the acquisition. There were multiple assassination attempts from Lyncs-become-Skype-for-Business-become-Teams department and I can only assume noone to fend for the foster child.

Skype under Microsoft had only seen sidelining and feature & platform regress, while it was a thriving product during eBay ownership. It may not be obvious from the bar graphs but it was apparent when one used the product.