Hide the lichess ID or chess.com ID apart from at match time when it is needed by the challenging opponent

some people don't like their lichess id being known.
The lichess ID on the match card should only be visible at the same time the pairings are eg 1 hour before the match start (and possibly an hour after)
The lichess ID (and chess.com) on the player record should only be visible to those with permission to update it.