There is a neat feature in Laravel called a Fallback Route. This is the route which will handle the request if none of the others can:

Route::fallback(Controller::class);

The fallback method is simply a convenience function which expands to the following:

Route::get('{fallbackPlaceholder}', Controller::class)
    ->where('fallbackPlaceholder', '.*')
    ->fallback();

Knowning this we can easily rename the fallbackPlaceholder parameter by defining our own route and chaining the fallback() method:

Route::get('{myPlaceholderName}', Controller::class)
    ->where('myPlaceholderName', '.*)
    ->fallback();