You have to realise that Defold is developed by a 6 man team and funded through partnerships and donations. We are not 2000 people like Unity and we are not making a ton of money on our own ad network like Unity does.
Creating videos is expensive. We can support community initiatives such as Unfolding Gamedev (by @Pawel), but we can’t pay for a full time person creating videos.
Correct. We do not have Ticktok. We do not even have a social media manager. We primarily use the social media channels we are active in ourselves, and yes, we are probably too old for Ticktok 
If it is any consolation the 6 man team working on Defold has around 100 years of collective experience working on games and game engines. It will to some extent guarantee that we know what we are doing while we create one of the best cross platform game engines on the planet. But it may also result in missed opportunities on new social media platforms.
More people != More money
More people == More questions and more support required
Don’t get me wrong. We want more developers. But we also need professional game developers that can ship games. Shipped games is great marketing and it will help us attract corporate partners that have money.