All my Adwords were also suddenly rejected this month. After several emails trying to establish with Google what the exact issue was they came back with an answer that the analytics must be “inline to the domain”. Now I have installed Matomo as a sub-domain to each domain I want to track, the Adwords adverts are now approved. Just edit slightly and it goes to the “under review” status.
Very inconvenient to not have all websites under one Matomo install but how can you argue with the Google behemoth!