Many municipalities still haven't gotten fiber deployments from the local utilities, and in practice you can be stuck on Swisscom's fiber. It's not too bad since several ISPs are also able to use it: for instance Sunrise before (I'm not sure they still allow it), but also Init7 (their Hybrid7 offering). However an ISP like Salt uses only open fiber, at least for now.
Salt and Sunrise had signed an agreement to push for extensive open fiber deployments by 2027. But then the deal blew up when Sunrise got acquired by UPC, since they'd rather use the existing DOCSIS infrastructure in the less dense areas.
Swisscom was going to push its own deployment as well (even though G.fast is not bad) and Salt was now interested in chipping in, but soon after the Comco has stopped Swisscom from using P2MP which is a big setback in its strategy to cover sub-urban areas. I understand the decision to enforce P2P deployments and give smaller ISPs a fair chance but it's definitely going to hinder the speed of new deployments. I believe we're rich enough, and we should mandate (and fund) open deployments in all these sub-urban municipalities that won't do it on their own.