The better solution is to break off the specifically non-contestable part of the firm (where the non-contestability is often due to network effects or barriers to entry) and regulate it so it has to be run as a fair and open platform. Sometimes this can be done as simply as requiring the firm to use applicable open standards to enable third parties to cleanly federate with its offerings - but the case of a leading search engine and general portal is not nearly as simple, unfortunately.