Why isn't Microsoft on this list?
They are, kinda.
> The Commission has also adopted five retention orders addressed to Alphabet, Amazon, Apple, Meta, and Microsoft, asking them to retain documents which might be used to assess their compliance with the DMA obligations, so as to preserve available evidence and ensure effective enforcement.
So, they are not under active investigation at the moment, but they are being monitored.
source https://ec.europa.eu/commission/presscorner/detail/en/ip_24_...https://ec.europa.eu/commission/presscorner/detail/en/ip_23_...
pointing out someone's stake in an argument does not constitute an ad hominem fallacy