I rolled a change out here briefly just so I could test it properly and all devices properly. Changing the api link to web is not going to work. It literally forces everything to WhatsApp web, even if you have a WhatsApp client installed. That's nowhere near what I'd expect the behaviour to be, if I'm a WhatsApp user. If I'm not a WhatsApp user, why would I be clicking it in the first place?
I have noted, however, that this is all down to an apparent change of behaviour in how WhatsApp handles the link. It seems as though they launch a window which then automatically tries to launch a WhatsApp app link, whether you have an app installed or not.
Ironically, this works better in Chrome on macOS than it does in Safari on macOS. Chrome at least prompts you to open the app store. Safari just gives up.
All thing's considered, there's no obvious reason to need to change this right now. If you don't have WhatsApp (or don't know what it is) you're unlikely to click it anyway. Any behaviour that doesn't appear to be "correct" is just a quirk of the browser that doesn't know how to handle it, or WhatsApp's own assumption that everyone has the client installed.
Ultimately, if this is a problem for your community, switch if off under Admin > Setup > Options > Sharing options.