More modern architectures tend to have a static frontend app which interacts with the API (see JAMStack architecture). The static site is just files (html, css, js) file that need to be served with no computation. For this you can use static hosting services, which are actually very cheap. For example, GitHub Pages will host your static frontends for free handling millions of hits a month (similarily GitLab Pages, and Netlify).
(I know it's been a while since the question was asked, but hopefully someone will find this useful)
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More modern architectures tend to have a static frontend app which interacts with the API (see JAMStack architecture). The static site is just files (html, css, js) file that need to be served with no computation. For this you can use static hosting services, which are actually very cheap. For example, GitHub Pages will host your static frontends for free handling millions of hits a month (similarily GitLab Pages, and Netlify).
(I know it's been a while since the question was asked, but hopefully someone will find this useful)