It's two different things: WeChat has a bunch of integrated apps, that's part of what Musk's vision is. The free speech issue is separate from the similarities to WeChat.
How could free speech possibly remain separate at WeChat levels of consolidation?
You spout wrongthink in a twitter DM, and now your bank, credit card, email, private messages, facebook, rail pass, amazon, uber, government ID, school accounts, craigslist and tinder are permabanned.