Public event crowd question

Actually, they are accepting "Illustrative Editorial" images for their newsworthiness. Here's what that help page says:

At Adobe Stock, we define illustrative editorial as conceptual imagery designed to illustrate articles on current events and newsworthy topics. This type of content often features images of real brands and products — like signs on buildings, soda cans, computers, and cars — to convey a story. Illustrative editorial content is made available to Adobe Stock customers for editorial use only."

However, they explicitly state that they don't accept Editorial images with people in them, so that certainly excludes any images from protests or rallies. 

I agree that this would need a Model Release since certainly that man in profile would recognize himself. Adobe doesn't accept Illustrative Editorial images with recognizable people:

For illustrative editorial, we don’t accept:

• Images that feature recognizable people 
• Images of restricted events such as conventions and sports games
• Images that feature tight crops of copyrighted or trademarked material, such as stamps, fine art, or other content that may violate privacy rights
• Digitally created or manipulated versions of trademarked logos or other brand content — other than social media icons