You're making it sound like the success of a language is determined purely by its advertising budget by pointing at languages that had financial backing, which

You're making it sound like the success of a language is determined purely by its advertising budget by pointing at languages that had financial backing, which disregards that financial backing allows for more resources to solve technical problems. Java and C# have excellent developer tools which wouldn't have existed in their current state without lots of money being thrown around, and the languages' adoption trajectory wouldn't have looked the way they did if their tooling hasn't been as good as it was. A new language with 3 people behind it can come up with great ideas and excellent execution, but if you can't get enough of the scaffolding built in order to gain development momentum and adoption, then it is very hard to become mainstream, and money can help with that.