Until this is all in place, there is still some scope for confusion whilst it remains possible for players to claim and play with a bonus they shouldn't. You only mention three brands, but others have listed more than this that would still qualify as "our brands".
If players can only use the bonuses on one skin, why not only HAVE one skin, then all this confusion would be a thing of the past. This is something all operators should look into. Some have spawned so many skins that it's impossible to keep track as a player, especially as when marketed they are marketed as though they are completely independent of anything else, with the truth being in the general terms, licence numbers, etc.
Even when players think we have the right picture about which brands are connected, say through platform provider or licence number, we have their reps eager to tell us they are "completely independent" of the other brands they are connected to. Cassava is probably a worst offender of note, but the same can be said of others. Everymatrix/Oddsmatrix, for example, seems to have a confusing stance on the issue. Sometimes they are merely the platform provider, with the individual brands being independent, then when it suits them they are all connected, and any term that applies to "our brands" applies to EVERY casino that uses the Everymatrix platform.