This would be so awful. Most vanilla services like redis, postgres, etc... would need to deal with the frontend spew directly instead of offloading that to a bridge as an intermediary.
The bridge just pushes the can down the road and you have to secure it. It assumes the internal network is safer which is kind of a security sham to begin with.
In the long run it would make the individual service software more robust because security vulnerabilities would get attention and get fixed. Therefore benefitting more than just the bridge owner.