Is it just me that think like 99% of IM projects don't require a lot of investment?
CPA - Spam social media with automation, can be scaled to 1000$'s/day
Affiliate - SEO targeting low comp keywords, maybe pay for content, but 200+ articles should be able to generate about 1000$/month (presuming they're low search volume)
Ads - SEO targeting low comp keywords again, this time you'll have larger search volume but still low comp, doesn't require much $$$ besides a bit of content and backlinks can be built for free
Freelancing - Learn some skills and $70k can be made per year "easily"
Paid Ads - Could generate startup money with free traffic, if you know what you're doing it's an instant positive ROI
This is just some of the things you can do to make money online ofc, you do see a trend though; SEO is definitely the one that can be the most costly. Although it can all be done for a small investment of like 10$/month for hosting.
Things like gambling SEO etc will of course be more costly, but the same amount of money can be made with less investment.
As everyone else are saying - could make $70k/year with 0$ investment, or $1M investment for $0/year.