We have some configuration coming down the pike to allow for communities to adjust the settings on how they handle cover images. Some can maintain the current strict crop-to-1000x420 ratio, but others will be able to allow for more flexibility.
You'll be able to set the upper limits for the needs of your community. We've made the constraint on DEV that cover images are not central content and therefore are limited as they are, but other communities will be allowed variation on this front.
For further actions, you may consider blocking this person and/or reporting abuse
We have some configuration coming down the pike to allow for communities to adjust the settings on how they handle cover images. Some can maintain the current strict crop-to-1000x420 ratio, but others will be able to allow for more flexibility.
You'll be able to set the upper limits for the needs of your community. We've made the constraint on DEV that cover images are not central content and therefore are limited as they are, but other communities will be allowed variation on this front.