Group refresh buttons

Problem:
Belonging to a group on SG enables user to see/participate in this group's giveaways. Unfortunately belonging changes only when user themselves syncs with SG (by their own will, pressing a button) and user, even kicked out of Steam group, who hasn't synced is still a member of group on SG. Inactive users remain in SG group listing, which is inconvenient.

Background:
There is the sync system implemented on SG. It resets for every user some 'sync' variable either periodically (lets say every week/month/etc) or when user tries to enter any giveaway and auto-check shows that last sync was done earlier than some time window (week ago/month ago/etc). Either one of these works now, probably latter, doesn't matter which exactly.

Proposed solution:
Group 'visibility' can work on similar principles, and for all user's groups simultaneously. At some point of time (but not dependent on user's entering GA, as it may never happen; likely, periodical server event for checking users), inactive user's account becomes flagged as 'outdated' and user gets 'hidden' from all their group user lists, which is equal to being removed from groups (but if necessary, there can be kept some local variables about user statistics in groups: given/received etc).
Optionally, group giveaways can be also hidden from user, may they log in to SG after a long time, but this is unnecessary as sync should be required to enter any GA

Discussion:
This doesn't solve problem with recently kicked users entering giveaways, but how it helps with people who don't login to SG:
1) Eventually inactive user disappears from SG group user lists. (User will not be seen by any group member. No need to create separate interfaces for Steam group creators and probably even moderators)
As a bonus, this doesn't require a user to be absent from Steam group. It cleans out all the inactive users.
2a) If such a user logs in SteamGifts [after a long pause], they are not in any groups on SG. After syncing they will be re-added to every SG group corresponding to their Steam group list, which is one of sync's tasks already.
2b) If user doesn't log in (more particularly doesn't resync), they can still appear in Steam group listing. It is choice of every group creator what they want to do. Probably if user didn't deserve a kick out, it makes no harm just to do nothing and to let user resync to group if they will return after a long time. Or periodical cleaning can be done. Anyway in Steam, creator(s) are free to do as they like.

Conclusion:
Everyone is happy and enjoying life. Steam support doesn't need to do anything. No one is force-synced by other users/against their will. Steam group creators basically don't need to do anything either and are in a full control, only having to wait some grace period for kicked/inactive users to sync themselves before they automatically disappear from SG list.

Thanks! (Turns out I already have this one :))

Meanies. All of them! :'(