I think one of the problems with adoption of decentralised projects in the general case is that there are so many competing platforms it’s hard to know which ones are worth making the effort to support.
Each time a new option appears, there is a burden of evaluating its merit upon anyone who is interested in using decentralised platforms. Usually the best way to find out what a particular platform is like is to actually use it, which is a time sink and can feel risky. In particular, for an outsider, it is difficult to evaluate (a) whether the software is secure and will keep their data and their hardware secure and (b) whether the software will enable the exploitation of their hardware and internet connection for immoral or illegal purposes.
PeerTube has had quite a few relatively high-profile endorsements, as indicated in your thread on the topic, which serves to encourage anyone who might be interested in hosting an instance. However, for me as an individual user, I see very little benefit in using PeerTube over YouTube if I am just going to have to use a node run by a third party. There is a trust relationship there, and frankly I trust Google more than any of the people running PeerTube instances. So, I am instantly in the boat of wanting to run my own instance, and therefore facing the barriers to entry that that creates.
Personally I think the best solutions will be those that foster a general purpose decentralised platform, analogous to The Web, upon which any number of different applications can be layered and tried out as easily as browsing to a new website.