they have bought Bunige with is a major 3rd party and have access to make their games exclusive, yes they have said they will remain on other platforms and we don't know for how long. they do the same thing, not as big as Activision of coarse but they do it. in the complaints about the deal they talked about exclusive content for cod and Microsoft and they have had exclusive content for cod and timed exclusivity read some of the threads about it.
as for Sony not doing it,
Impala warns of Sony’s “near monopoly grip” on European charts if EMI Music Publishing deal is cleared Impala, representing the European independent music community, is upping its efforts to block […]
musically.com
not in gaming but do it elsewhere when they can