You're right about it being relatively easy ro build your own version of something right now in the proverbial garage. But startups will still have to compete with the network effects of the large firms and the increasing push for data sovereignty from non-US customers. Not to say it's not possible, just that the technology alone isn't sufficient.

> It does not seem hard now to rebuilt Google Search, Google Chrome, Gmail, Gsuite, Netlify, Vercel, Cloudflare, Vimeo, Twilio, or even Stripe. The cost barrier has to have dropped 1000x, maybe 10000x.

[citation needed]