Cover is trying to extract blood from a stone here by taking their moe/idol otaku type audience who only ever, ever, EVER were here for cute/sexy girls, and asking them to like dudes now. it'll never work. never. they need the actual female audience to join in and in Asia overall that is like 98% spoken for as being Anycolor's property.
Tempus had initial inroads as being the fabled brotubers, but even then, most people only have so much free time in their day, if they have to prioritize between watching a cute girl holo or watching a dude holo they will usually choose the girl. even if you're 100% the ideal brotuber experience you're still not as good an option to spend an hour or two on vs cute girls or your oshi etc. It's like going to an ice cream shop and getting just plain vanilla. Only in this case Tempus/Magni have proven to be outright prima donnas which is funny considering they're more of entitled emotional bitches than most of the girls as it turns out, so the whole brotuber angle is long dead and you're left with just that tiny fleck of female audience they've secured. Fortunately for Tempus, NijiEN is an even bigger flaming dumpster so they've managed to peel off a couple of their fans I think, but "the other company sucking even more" doesn't mean Tempus was particularly competitive, just existing was enough.