I don't think it's that Joe can't be bothered cause he's already rich. He's not lazy like his sister, I think he is just tired of the youtube scene in general. From his videos before Strictly he just doesn't seem happy, he's fed up, can't say I blame him, he has obsessed kids for fans when he tries to do more mature content or new types of videos, like the dance promo he loses viewers, he clearly doesn't want to do the same old YouTube stuff, but doesn't want to let the minions down.
But since Strictly you could see he was clearly much happier in himself and doing the tour vlogs, he was uploading more and was clearly enjoying vlogging again, but his views & subs kept going down and since that dance video, he is rarely on his social media only to wish Dianne luck.
He is clearly lost and doesn't know where to go. I hope presenting works out for him cause his channel is going downhill and he is just going to put out the same tit just to keep the money rolling.