Whatsapp has caught on to the point of utter market dominance in places where most people speak very little to no English. Without being aware of "what's up", there's no connection to communication at all. Still worked out well for them.
There's no connection between Amazon's brand and what they do, and yet Amazon Inc doesn't seem to suffer, and I don't think Apache Kafka is self-explanatory to just about anyone. Or Sprite (the beverage), and who really gets the name Pepsi? What meaning does Facebook have for anyone outside the US education system? I'm not from the US and I have only an extremely vague idea. No idea about the etymology of Ikea. Slack has actually been a tough sale in more conservative organisations before it got so hugely popular, probably in part because of the negative connotations the name carries – who wants to put their name underneath spending lots on a tool nobody knows, but that's named "Slack"? – and while I don't have a very large set of anecdata for this, I believe the same is true for Riot, maybe to a lesser degree because of the Matrix brand.
It's not catchy, I agree, more like – bland? I think that's fine, it doesn't have to beat Slack on controversial naming. Matrix could become absolutely huge by being adopted in large EU organizations and orgs elsewhere worried about exposing all their communication to the US, so being a bit bland is a feature, much like MS Teams, which must have people in charge of making the product as boring as possible, but it's making inroads into close to all large orgs over here that I'm aware of, and being deeply uncontroversial is certainly part of the reason why.
Plus, for catchiness, there's always Matrix, and I actually like the Element-of-a-Matrix jeux-des-mots.