Maybe for the top tier influencers, but there are a ton of people making a reasonable living just by doing it what they enjoy. For example, strategy game streamers:

• FlorryWorry is probably the most popular EU4 streamer and has won the tournament something like 7-years straight; he makes enough to go full time
• NumotTheNummy is perhaps the best MtG Arena draft streamer, and has tons of subscribers (LSV honorary mention, who got famous for being a top-tier MtG pro tour competitor)
• Hikaru Nakamura - #2 chess player in the world, has a very healthy following

There are plenty more who are popular because of their skill at what they stream about and are competent enough at keeping people's attention. If you're the best, people will come to you, it's not always just luck. A lot of people get there through luck, but a lot earn their way too.