Really wish professional YouTubers caption their views more often. I understand captioning is very expensive, but at this point you really should be asking your sponsors to foot the bill for accessibility.
And it's not unprecedent. TV used to be like that. Bumpers like this will forever be etched into my memories:
Video description:
Old late '90s, early 2000s YTV bumper. A monster or alien-like being is sitting by a TV. Text on screen is narrated by an announcer: "Closed captioning brought to you by …" The alien thumps the top of the TV, causing the signal to change to a Coca Cola logo. Narrator continues "Cola Cola." Zooms into the logo.
If every YouTube video is gong to be sponsored, might as well put accessibility on the negotiation table before signing the contract.