It does need to be initiated by Itch for the coverage.
I have tried twitter to no avail.
Viewing post in Let's create Ukraine Aid Bundle
I am pretty sure here we have a potential of generating multimillion dollar donation for this cause and I would guess there are legal hoops for giving that sum of donation, especially through itch.io platform as a mediator between transactions, therefore I think we better have it done by itch like the bundles before it. But hey... who am I to say I am just an ordinary hobby dev who haven't done fundraisers.