which got basicaly monopolized by BlockStream and Bitcoin
Can you explain this for me? Bitcoin Core is a project with dozens of people. One of the main developers of Bitcoin Core is a founder of Blockstream. And this is "monopolized"? Please, help me understand what you're thinking here.
Meanwhile, the developers of other implementations just don't bother to tell you about their business partnerships at all. Makes me sick.
I hope you dont want compare partnership with PwC and sponsoring from successfull Bitcoin companies like Coinbase. If you do, I suggest you google controversies about PwC and what damage it can cause to Bitcoin when so many important Bitcoins developers are sponsored by Blockstream partnering with PwC.
Many important Bitcoin Core developers are sponsored by Blockstream and althought all these sponsored developers can have similar vision of Bitcoin future as mostly settlement layer for offchain solutions even if they received no Bitcoins from BlockStream, they are more likely to make little compromises than they would do otherwise. Maybe for example supporting artifficial blocksize limits now before offchain solutions exists and provably works - althought I dont understand why Blockstream want limit bitcoin adoption this way, I personnally know when Im paid by clients I dont mind doing favours back to keep good future relations.