Got shadowbanned (limited matchmaking) for 2nd time in about a month in Modern Warfare 3.
First one was right after an update mid-December, got unrestricted exactly 7 days later. Played for a few times in January and got shadowbanned again right after new S2 update in BO6.
I can see this is a very common thing by looking at Steam forums & Reddit. Basicaly either not finding any in some game modes, or getting matched only with other PC players with 100+ ms ping.
It feels like players are getting shadowbanned in some waves/batches after every update, potentially to force them to move to BO6, but I also saw that people get same treatment there.

70 € for a game that you're being prevented from playing, I don't think this is legal in EU.

Got shadowbanned (limited matchmaking) for 2nd time in about a month in Modern Warfare 3. First one was right after an update mid-December, got unrestricted exactly 7 days later. Played for a few times in January and got shadowbanned again right after new S2 update in BO6. I can see this is a very common thing by looking at Steam forums & Reddit. Basicaly either not finding any in some game modes, or getting matched only with other PC players with 100+ ms ping. It feels like players are getting shadowbanned in some waves/batches after every update, potentially to force them to move to BO6, but I also saw that people get same treatment there. 70 € for a game that you're being prevented from playing, I don't think this is legal in EU.