It’s a lot easier to say to someone, “Hey, here’s a FOSS alternative to this corporate app you already use, it functions the way you’re used to” than “Here’s a FOSS app that does something completely new.”
True, but it does also lead to the question when things go awry or are awkward on the alternatives to, “Why would I use this less reliable/more complicated alternative when [corporate option] ‘just works’?” That reliability/simplicity will more often than not win out in the absence of more novel, useful differences.