It may exist (with a loose term of exist) but they are all mostly garbage. There's still plenty opportunity to make non-garbage version of things that already exist
This is technically true but also a bit naive. Established incumbents are very difficult to dislodge with merely a better version of their products. This becomes more true the larger the product and the average customer size. A good example is QuickBooks, which is a really janky accounting/bookkeeping software that is almost universally hated, but newer and better solutions haven't been able to capture much market share from it.
They are not garbage, they are just deeply integrated where a newcomer thinks there is better way to do this but no gurantees you can make it better