Tecent already had a diversified Internet business before they launched WeChat. Musk needs a whole portofolio of companies to enable his mega-app vision, and that is not considering all the anti-competition lawsuits coming his way should he acquire those companies and refer to them exclusively within the X app.

FB/Meta and Google likely had similar ambitions and they haven't succeeded in building one despite being in a far better position to do so. Google Maps is probably the closest thing we can get to a mega-app in the Western world, for now.