Thanks guys for insight. Actually he intends to give them free until he gets a secure foothold in the trade. But it should lead to monetization later on when he gets a sufficient fan base.
I was suggesting that he may even start recording other people's events, small scale ones, for free so that he could make an income until the music production gets noticed by people.
I am still not very clear how this could be done, I mean monetizing music but I guess that creating a website, subscriptions to Patreon and similar sites as mike birch said, and social media would be the ways to go.
If you record things for free, you're not making any money.
You need really good video skills to have a product that makes enough impact for people to be willing to pay for it. And, depending on what the video content is, the audio quality may need to be better than any built-in camera mic can provide. But, really, you are battling a world where everyone can make a video with their phone, and post it instantly, and the attention span of the viewers is measured in seconds before they are off to the next thing, unless it is especially unique and captivating. Oh, and small/new bands never have money to pay for this stuff, unless one of the members has a rich relative to bankroll promotional stuff. (All this IMO, of course.)
So, if your friend wants to make money, the first thing to do is figure out how other people are making money doing what he's thinking about, and how much money they make per gig, how many gigs they can get at any price point, and how that turns into be a positive/net income stream. What kind of gigs pay well (hint, weddings) vs equipment and time requirements to make the whole thing viable, what other types of services can be offered that might be outside the original concept but maybe take less work or investment and keep some money coming in while waiting for that viral YT event (audio transcriptions? recording business presentations, e.g. for reuse in training? Etc.) I.e., a
business plan that has some researched end point that describes what the profitable business will look like, and how he gets there. It's all going to depend on the market and the person's abilities and initiative.
It's one thing if you want to have a hobby and give stuff away, but people tend to value something based on what they pay for it.