title says it all, steam and epic are usually good
Trainers are made if the community show enough interest in those trainers by adding them to their WeMod favourites. Or by boosting them (Pro feature).
If there isn’t enough interest in having a trainer made or updated, then it is lower down the list of priorities.
See here: Game Queue & Boosts - WeMod Support
Unfortunately, Windows Store (aka Xbox Game Pass) is an extremely unpopular platform in the gaming community.