I don't see any idea how Challenge Accounts could be used without destroying players with small ratings.
At the same time, we can do:
- Tournament, 2-3 2400+ rated players vs 4-6 around 1200 rated players
- Zeroing the ratings (if you like a bit of chaos)
- Make at least some clan event/tournament (clan should use players of different ratings)
- Streamer Battle (we can think of so many different formats).
And many other activities/tournaments with interesting and rare formats.
If there is a specific suggestion from a known faf streamer/caster and the moderation team doesn't think there will be toxic consequences from it, Challenge Accounts could be allowed as a one-time exception.