SPS 2016 licensing for MIM Portal?

Hi,

So back in the day, SharePoint Foundation (2010 & 2013) was free to use (thank goodness as it is a FIM/MIM Portal prerequisite).

What's the story on licensing now that SPS 2016 is supported for MIM Portal?

Will SPS2016 require additional licenses (in addition to MIM licenses)?

Thank you,

PS. Microsoft SharePoint Foundation 2013 Service Pack 1 Mainstream support ended on 10/04/2018...so if a customer only has mainstream support, we have to use SPS 2016.