So I can tell you from my experience blogging, it is not as difficult to monetize your gaming vlog/vlog than uploading videos/live streaming via one of the major platforms like Youtube, Twitch, and or TikTok. This is because, more often than not, you really don't start making any decent amount of money until you get into one of the various different "Partner" or "Affiliate" (examples being: YPP: Youtube Partner Program, Twitch Affiliate/Partner, TikTok Next/Creator Fund, just to name a few!) Youtube and Twitch don't pay you for the ads they run on your stream/video uploads until you qualify for their respective programs, same with TikTok. This doesn't mean you can't do things like Affiliate links, Branding/Sponsorship deals (which are extremely hard to obtain if you're NOT in one of the programs).
With a vlog/blog, no programs are required, just a little harder to get traffic than say a LARGE platform like Twitch and Youtube, but outside of that, you are the one that controls everything, not the platform. You do have some upfront costs, but you can argue there are costs on the video content too, like high end gaming hardware, webcam/cameras, highspeed internet, etc. In comparison, the costs with blogging is FAR LESS than getting equipped with quality creating, streaming and editing hardware.
Thats just my experience and outlook on the subject. Hope I was helpful!
PS: This was my FIRST POST in this community, I just found you all last week! So ummm, Hi!