As many other things on the internet, the original idea was great (renting your couch or a room in your house for tourists to accommodate and feel a local experience, but once it reached the masses, and speculative companies bought properties just to rent them and pay cheap labor to maintain the rooms, it became BS one more time.
No matter what those whose drive is pure economical touch, they always ruin it.
Blender by a huge mile. Yes, there’s tons of other software like Linux, of course, but Blender is such a powerful, well managed, economically viable and healthy (community) project that it should be shown as an example of how Open Source should be.
My biggest hurdle with other projects is the fanboys, because many times they’re quite toxic, insulting everybody who doesn’t adore the project and don’t accept constructive criticism.