A few thoughts

1) It annoys me whenever anybody mentions literally anything (whatever baking soda, potassium, any vitamin) you get a million unhinged comments about how this was a personal panacea.

2) Creatine definitely does stuff, that's scientifically been established by numerous studies for decades. It's been recommended as a supplement for vegetarians for mental reasons and for people trying to build muscle-mass (sort of niche). I'm actually a bit surprised how few people talk about it when it's a standard blood test thing (possibly because it can't be patented).

3) It's dirt cheap and made by tons of difference places. I don't think there's a "big creatine." It's probably like < 25 cents a serving.

Even quite a bit cheaper than that, I buy 1000g of creatine for $30 USD, which is 15 cents per 5g serving. I think it's a no-brainer for most people.