Developer / Publisher
Details and Conditions
From Riot Games' Legal page:
"You may not create commercial Projects, including any Project that crowdsources any portion of its funding, any Project that involves a business or legal entity, or any Project where you gate the content with a paywall (e.g., Patreon, YouTube Premium, etc.) without a written license agreement from us. We have only three exceptions."
"We permit individual players to promote their Projects on websites, streams, or videos and passively generate revenue through appropriate advertisements, including pre-roll ads, ad breaks, and sponsor ad overlays."
"We permit individual players to solicit personal donations or offer subscription-based content while live-streaming games, so long as non-subscribers can still watch the games concurrently."
See more details by clicking the "source" link below.
What it Means
Videos and streams ARE allowed
You CAN monetize on YouTube and Twitch with ads and subscriptions
You CANNOT sell or charge for access to your content (this would include Twitch "subscriber only" streams or selling merchandise)