no one ever tactfully includes ads
This is pretty patently hyperbole; I’ve run into many sites, including news, with non-intrusive ads.
Whether it’s class-based gatekeeping is another matter entirely. For-profit media employees have to eat too, and in the current economic system most can’t just give people access to content for free without any sort of monetization mechanism and with a voluntary subscription, because that’ll very often lead to income dropping off a cliff. Unfortunately people are very loath to pay for online services except for some more niche cases like the Fediverse where instances run on voluntary donations – although I’ve seen a couple of moderately popular instances struggling with upkeep being higher than what people are willing to donate (and it’s not just services either; open source developers face similar issues.) In some countries we at least have public broadcasting companies, although eg. here in Finland the current extremist right-wing government is looking to reduce its funding by quite a bit and possibly even entirely dismantle it if they get their way.
While I definitely agree that news should be available for free, railing against a for-profit publisher’s paywall is, frankly, myopic; like it or not, in the current system even content producers have to make a living. None of us really has a choice in whether we want to live in this system or not
How do you propose these “open source journalists” make a living? Corporate grants or straight-up corporate jobs just like a huge chunk of Linux development, landing us right back at square one, if not even somewhat behind it? At least independent media exists nowadays, but if the assumption is that all news has to be freely available, like acastcandream said that’d just lead to journalism being very effectively locked out as a career path for anyone who’s not independently wealthy or somehow able to make people actually donate or pay for a subscription despite the content being available for free – and that hasn’t worked out too well for most publishers so far.