YouTube is only going to push things it thinks you will click on, regardless of whether you're subscribed or have notifications etc. My feed was full of EnReco and Shiori always pops up on my front page and shorts, as well as recommended clips because I actually watched stuff.She is cute IRL, but it's always funny to see how small of a chest she has considering how much of a point she makes of it, how massive they are, point of pride, etc etc as Nerissa.
I wasn't aware myself, but from comments I'm seeing on clips of their Nekopara stream, apparently they did the official EN translation for the series when they were working their previous jobs for Project Sekai or whoever did the localization. So another tie-in for them.
On a tangent, I don't follow HL as closely now that all my favorites (Gura, Fauna, Mumei) graduated, but I still do watch a few of them (mostly Biboo and CC, occasionally Bae, IRyS, couple others) from time to time and have notifications turned on for streams from many of them in holoEN, as well as follow many on twitter, and am joined to the hololive subreddit. Even given all that, I had no idea until the YT algorithm saw fit to show me some clips that there was a pretty big Mario Kart tournament and some big Minecraft event going on? Sometimes it feels like EN (and ID) really is kind of an afterthought, unless you are like FWMC and can live there and engage directly with the JP side and insert yourself into those kind of things. I guess they know where their bread is buttered though.
It really seems like if you want to thrive in holoEN nowadays you need to move to JP (or be willing to travel there a TON) and be able to communicate in JP as well at least somewhat. It makes sense why those who didn't want to do one, the other, or especially both, ended up leaving. Could just be rrats or me out of the loop though now, as I said before I'm starting to fall behind with less incentive to keep up.
Side note, I don't understand your point with the Mario Kart and Minecraft event. EN and ID are an afterthought because...JP events and clips aren't being recommended to you?
But in that vein, like it or not remote workers in all industries will get the short end of the stick compared to someone who can be on site and interact with others naturally. Younger generations and socially awkward folks may cry that they work just as well remotely but everyone staying in their own silo is how projects and businesses fail even if everyone is doing their part.