A while ago, I was in the same boat. Why try to recreate GitHub, or Uber, or Salesforce, or Facebook? And once I discovered any competitors in my idea's field, I would chalk it down to "not worth trying" and call it a day. But then I realized, if my town can have 3-4 Chinese restaurants with the same exact menus (probably supplied by the same exact distributors), and they've all operated continuously for over a decad…
Also worth noting the downside of scale: some opportunities are "too small" for a Microsoft or Google to pursue. Google revenue for 2018 was $136.8B. Extra effort to possibly address a small niche segment of a market, that would improve revenue by $1M per year, is too small to draw anyone's attention. However, that same $1M/yr is enough to sustain a bootstrapped business and even possibly build the credibility to rai…
Competition isn't bad - that just means there's a market large enough for different companies to want to fight for a share of.