An issue for me as well.
I was able to get past this issue by adding babel.config.js in my root directory with the following setup:

module.exports = {
  presets:[
      "babel-preset-expo",
      "@babel/preset-env",
      "@babel/preset-react"
  ],
  plugins:[
    "@babel/plugin-transform-react-jsx",
    ["@babel/plugin-proposal-private-methods", { "loose": true }],
    ["@babel/plugin-proposal-class-properties", { "loose": true }]
  ]
}

However, it led to an error stating I did not have the correct loader as seen in this issue. I then followed the top voted solution on that page, only to lead to a third error as follows:
"Can't resolve 'react-dom/unstable-native-dependencies'"

I tried running npm install [email protected] to see if it was due to the newest version of react-dom and the error went away.
Yet, now the page just loads a blank screen due to a frontend error of: TypeError: Object(...) is not a function
js index.js:15

At this point, I'm tossing in the hat. Hopefully they're web version gets up and running again. Hopefully someone finds this helpful.