Board Game Arena

The "zoom in" / "zoom out" we can find in Chromino, Azul, Backgammonmatchplay are really helpful, especially when you play on your phone.
My suggestion would be to implement this function in all the games. In deed, it is impossible to play for example at Codex naturalis on your phone..
Tom721.

Browsers already have zoom functionality. On a desktop/laptop machine press Control and plus to zoom in, control and minus to zoom out. On a phone or tablet, you can "pinch" to zoom.

Maybe the specific "zoom" functionality on the games you mention is a bit nicer, but no game should be unplayable because of lack of zoom, given that browsers already allow you to do this. And it would not be easy - or perhaps even possible at all - for BGA to implement this as a blanket feature for every game. It's something the developer of each individual adaptation would have to do themselves.