It doesn't really matter if it's "usual" or not, that's a different question.
Most industries consolidate into large behemoths that are incredibly inefficient and only stay in business due to patents and buying up all the resources (e.g. cell-phone companies, comcast, certain chip-makers). Innovation dies.
And you're right, it's happening right now with youtube defeating the these corporations, and that's good. But if one of these companies somehow bought youtube from google, that'd be bad, because consolidation (especially around distribution of information) is typically bad.