Am I missing something? I thought Blockstream was about sidechains that are linked to the central Bitcoin blockchain. This would seem to be a great concept, and I believe we need more of them. They could remove the transaction pressure caused by micro-payments from faucets and gambling for example. So what if a sidechain is privately owned, at least they are supporting the public domain Bitcoin structure. Conceptually Bitcoin wallet providers create a form of sidechain, but nobody attacks them. PayPal, Visa and other payment providers are "sidechains" for fiat currencies, but again, people seem to think the concept is good, even if PayPal is a bad service.
Sidechains are great in fact. The problem many people have with blockstream is that bitcoin is working worse and worse because it is restricted by blocksize limit. The developers don't want to fix this but instead suggest using the lightning network, which comes from blockstream. So alot of bitcoiners feel like they get extorted by the bitcoin core wallet developers to use the system they create besides bitcoin.
That is the problem many have with it.