
Out of universe, the reasons for this seem pretty obvious, as What Pumpkin does not want to get involved in a case of copyright infringement, but in-universe. Now, the exact reasons as to why there is such a divide clearly belong in Headscratchers.Homestuck, but Hiveswap adds one more layer of complexity: in Homestuck, the Alternian script is simply the Daedric script rotated 180 degrees, while in Hiveswap, the Alternian script has been created from scratch (pun not intended). In Homestuck, the script that some troll objects (movie posters, magazine covers, the Ouija Fetch Modus) use is an Alternian script, while for others (anything to do with Trollian and the IM service that Xefros and Dammek use, the ~ATH book and code) it's what we know as the Latin alphabet.
or doesn't, but the point is that there's tons of precedence for this precise sort of ambiguous connection.
Regardless, this is still the exact kind of Weird Plot Shit that shows up all the time in Homestuck weird synchronous stuff that seems to make no sense at first and eventually comes around. Similarly, your example doesn't really include a Stable Time Loop either just something from the "effect" that influences the "cause". There is nothing in it constituting a paradox the only inspiration that the Felt had for Table Stickball was their hats and not Arena Stickball, which would create a Stable Time Loop. Basically, the answer seems to be how can Bec and Doc Scratch be powered by the Green sun when their universes blowing up is what creates it. It's the type of paradox Homestuck is famous for. And even if you assume that the Felt did exist in pre-Vast Glub Alternia, a bunch of mobsters that aren't even trolls (given the Condesce's stance on aliens, they would have been killed off fairly soon after their arrival) creating a game that then spawns a spinoff that leads to its own major league and video games is, to say the least, odd. how is this possible? We know that Caliborn collected the Felt during his Sburb session and brought them to Alternia, but we have only ever seen them (besides Doc Scratch) after the Vast Glub, meaning that the Felt could have in no way brought Table Stickball to pre-Vast Glub Alternia to be reworked as Arena Stickball.
From Homestuck, we know that Table Stickball was invented by the Felt based on their hats, and there is a clear relation between Arena Stickball and Table Stickball (not just by name, but also by the fact that there are various balls themed after the Felt).