I wonder if the "limited resources" are due to them potentially losing a whole load of customers recently.
You know, if their tech truly is as open-source as they market, then they've still contributed hugely to the ecosystem. If it turns out it's not actually operationally open-source, then this will be remembered in a hugely negative light.
Edit: I did just see their post about being impacted by the US spending cuts. I can't imagine Proton would be super happy about that administration at the moment. But then again, who knows these days.