Explorer browser has a competitor?
Well, browsers have always existed before Netscape, but those could hardly be called competitors.
Because their user experience was extremely poor, there was no dedicated team maintaining them, let alone updating their versions.
However, Explorer had a qualitative improvement, not only was it more graphically intensive, but it was also easier to use.
Explorer also had the support of Netscape; Teresa and her team were always providing customer support for this software.
Some bugs reported by users were recorded by Netscape and would be targeted for fixes in minor version updates.
It's safe to say that Netscape was operating Explorer as a product, even though it wouldn't bring any profit.
And all of this required costs: manpower, material resources, hardware facilities...
Without a doubt those miscellaneous browsers would not invest in these because their creators might just be amateur computer geeks.