Consider that in 2017, 21 billion ARM chips were manufactured (doubled in 4 years, from 10 billion in 2013), and that ARM's licensing fees are over 2% of chip cost for current high-end designs (and they're talking about raising that even more). They have 95%+ of the mobile phone market, are making inroads in the server market, and will soon be in every Apple laptop, which I expect will grow the market for ARM laptops even outside Apple. It wouldn't be a stretch to find them in common desktop computers after that. They're in smart TVs, washing machines, robot vacuum cleaners, and all other kinds of smart (and non-smart) appliances. Even SSDs have their own embedded ARM chip. And that's just home/consumer stuff; haven't even scratched industrial/commercial applications, of which there are a ton.
I could easily see yearly production at over 100 billion chips before 2030, probably even before 2025. While I'd love to see something like RISC-V take off commercially, I don't think that's realistic.
Meanwhile, social media users are incredibly fickle; platforms are subject to fad and fashion. Certainly Facebook and Instagram are still huge behemoths, but their growth is nothing like it once was, with people -- especially younger people, trying to distinguish themselves from their older, boring relatives -- flocking to TikTok. I fully expect TikTok will be in Instagram's boat in under 10 years, with some other platform taking its place.
ARM seems like an amazingly great short-, medium-, and long-term bet, while TikTok feels like a nice short- (maybe medium-, if they're lucky) term money-maker, and even that feels like a big maybe: I have no idea what their ad revenue per user looks like, but it's probably not great since their audience skews younger. Teenagers and college kids don't have much in the way of discretionary income. Then again, TikTok doesn't pay their creators like e.g. YouTube does, so they get to keep all that ad revenue.