I think you're reading too much into this
First of all, I'm not part of their staff and I only upload their stuff
I may be reading to much into it indeed, especially since I learned just a bit ago that you uploaded various other things at this same time, but you may have gotten clearance to upload this chapter after 8 months due to the upload by Wukong Scans. You not being staff is odd, only admins or members of the group can upload using that groups name, so it'd be nice if you elaborated what you mean, though do know that I don't mean to target you, my grievance is with Glitched Scans.
- The chapter gap I have to keep doesn't apply if another group uploaded a chapter and has nothing to do with "maintain[ing] monopoly on this manga" (lmao how did you even get to that conclusion)
The community overall believes that it's not great if many scanslators work on the same manga, due to there being many good manga that still need translations, for example TOOR Scans is the only one doing 'Ascendance of a Bookworm' and even if they are late on the uploads, other scanslators are not to cover that manga, as these other scanlators are needed elsewhere. Hence, if you upload semi-regularly, even if you are behind the raws by 12 chapters, no scanlator will cover your manga and you can safely advertise your website and donation box there without challenge.
It is unfortunately very common for some Scanlators to just do a few chapters and then stop uploading, only returning to the manga or webtoon if the work is being "sniped" so to keep the status of the work as not having been abandoned and therefore up for the taking by other scanlators, stretching the "semi-regularly" part of my earlier paragraph. I am aware that Glitched Scans does complete some of the works they start to scanlate, so I will not argue that they egregiously engage in that practice, but it is hard to not draw ones conclusion on just how many works this group starts and doesn't finish.
- I apparently overlooked this chapter a month ago when I went back to check which manga are missing chapters
- I randomly chose today to upload, which is a complete coincidence that I noticed this manga in my feed and went back to check why ch. 3.1 isn't already uploaded
it's been 8 months, one does not accidentally fail to do uplaods of something for that long, I am aware that Glitched Scans needs to pay its bills and earn something from this in order to remain motivated to do the work, so I can reason delayed uplaods to mangadex in comparison to their site, but this is too far.
there is no reason why this chapter shouldn't be uploaded, just because another group picked the manga up
rather then not uploaded, it should have cleared that Glitched scans is official in abandoning the series due to being far behind on the raws and other scanslators wishing to take the mantle. And if it is so that Glitched Scans wishes to further pursue scanslating this work, then it should investigate if and why it would want to inspite how having presented such postponed uploads.
TL;DR: Scanslators don't generally work on something that is already being worked on, by showing that Glitched Scans has interested on Scanslating this manga by uploading a chapter, it is discouraging the other Scanslators to cover this manga, with the purpose of securing advertising space for their website and donation box. It may, however, have been entirely accidental, it may not have been, Glitched Scans nonetheless failed to address this potential change in scanlator to this work and weather or not they are still pursuing scanlating it as the culture on mangadex does not take kindly to multiple scanlators doing redundant work.