#1 - June 27, 2022, 7 p.m.
“Unlocked by participating in the support a streamer: Medic Brigitte event” 
Found it here on Reddit:
Update: You must gift 3 subs to selected streamers in order to get this skin:
New Brigitte Legendary Skin "Medic"
#46 - June 27, 2022, 8:02 p.m.
You are far over estimating what all but the most successful of streamers actually earn
If you don’t wish to donate to one of the bigger names, we’ve listed many smaller long time Overwatch streamers who would be overjoyed to have your support
#61 - June 27, 2022, 8:10 p.m.
For this first event, we intentionally kept it to a limited list. This first SaS is for us to gather data and learn. Should it be successful, we’ll build on that and most likely expand availability.