Digging in, there are a few reasons actually - first is, Chrome removes extensions with this kind of functionality from the Web Store constantly (only option would be to sideload).
Under the hood, Incoggo is also actually a local proxy (it adds a trusted root cert during the install process - we have some details on this / other potential issues / concerns on our forum). Reason for this being, Chrome extensions can't modify inbound requests in the way that's required to unblock several of the publications we support (NYT, Bloomberg, WaPo being key examples).
Really making the longer-term bet here that with a lot of work, the underlying proxy infrastructure will enable a lot of really interesting possibilities, and the shorter-term bet that with this approach we can create the best / most effective adblocker for paywalls by far.
Also, screw building extensions for Safari.
That's a non-starter for me. I do not want an application to be able to MITM all traffic.
Surely you just need to be able to MITM certain domains (the ones of the paywalled websites you unblock), can't you just create individual self-signed certificates for those and trust them one by one?
The reason for the root cert is that in short order (after cleaning up our infra, etc.) we're actually planning to expand to a full-spectrum adblocker.