I think the "plugins and widgets" path to making money easily ends up being detrimental to the original free thing. Instead of spending time just improving the thing, one ends up carefully planning out what can acceptably be broken out separately, how to make the thing extensible, billing, advertising, funneling...just all kinds of garbage.
Eventually you end up with a load of staff who are dependent on the thing for their livelihoods, and that influences decision-making. Next up is selling to a company with big resources "to empower us to complete the original vision" and soon after a new scrappy upstart releases their free alternative, to start the cycle again.
Very true, the vision of the system may alter a little bit, if in the future there are commercial sponsors. Every new version will have to be more conservative, so as not to break compatibility, development will slow down, more bureuocracy etc.
I think the future of education is portraying it as a game, history as a game, engineering as game etc and solving puzzles along the way. Lichess as a platform may be useful in that regard, because a game to be enjoyable doesn't need to have all the fancy 3d graphics.
Joomla is open source and their devs make so much money selling plugins and widgets. Who is the best man for the job to tweak the platform than the developers who made the open source core of it?
I use lichess everyday for years, the stability of the platform is absolutely top notch. An absolute minimal amount of bugs, no glitches in the website, every page i click on, loads instantaneously. The commercial website Chess24 and closed source, doesn't have "ultrabullet' games, very quick games of 15 seconds, because their platform cannot support it. lol