In my eyes, MultiModeFibre is on it's way out.

The high speed (25G+) does not have good solutions for multimode, and the length limits that physics enforces with multimode mean that it's not "no-brainer" applicable for going any more than between the same rack row.

So if you are dealing with datacenter cross connects that can exceed the max distance for MultiMode then you might spend hours debugging broken stuff for no real gain. MultiMode is slightly cheaper, but it's a false economy the moment stuff does not work correctly. I've spoken to people with DC cross connects that go into the 5km+ of cable distance. So it's easier to just stock one kind of optic per speed, and call it a day.

Equinix I think already phased out MMF XCs