After researching the topic I got an impression that featuring a product on a stream or instagram is more powerful than ads on youttube and instagram. Is it true? In tha case it looks like that more and more companies should start allocation most of the marketing money towards accessing the customers via the social media channel and the influencers. Would be happy to read some good article and analytics on this topic.
Streaming is still a new, and quite unexploited, marketing channel within the broad social media marketing. Having worked within global brands, we have still not invested much on streaming, rather than testing some of those features. One of the reason for lower investment on streaming is still the lack of a trustable analytics framework to measure this performance. Every marketer is fully aware of the potential of video content and the relevance of "on-the-spot" content, however, solid marketing analytics frameworks for in-streaming media need still to be widely used. Nevertheless, my advice is definitely to test those formats having clear in mind how those would impact on our clients' journeys.
It’s actually better for the brand to be more established on multiple platforms because as the targeted person switches apps, they will see your image again. This really increases the chances of you getting clicks and converting. The money aspect of your question is easy, start off by doing the same amount on each platform then adjust as you receive more data. Great question.
You are asking a very broad question. It is going to be very different for every brand. It really depends on each brands goals. A company might find that they get a better return on advertising spend when partnering with a Twitch streamer than running a YouTube ad, but for a different brand it could be the complete opposite. Each brand will have to test their own strategies to discover what works best for their company.