devlogs are for reading, you dont give away anyone infomation and uploading melwere thing is impossable.
Publish projects are not that abused with itch.io scanning and players reporting it. mods remove it quicker than steam.
you can not control feeds, there is no rule on it like steam.
game jams are game james, people can report any jam that looks like a scammer might steal their info.
What you want with email can be abused for both gamedev and players, the infomation is not going to be accurate. ask anyone in steam when they ask for email, you'll see how easy it is to just add random fake emails into the list. steam even allows fake emails to be counted as accounts. nothing about the email marking is ever going to work.