And if the project isn't worrying about bundle size at all, then even their vanilla/jquery page is going to end up bloating a ton as well.
More often than not the culprit in 2mb bundle sizes is a a few packages that include "data" in the bundle (For example, i've seen timezone and locale information bloat bundles by megabytes, and in one case a 5mb bundle ended up being 4.6mb of zip codes...)