I agree overall games especially COD/AAA titles are all about the kill streak and the perks you get with that and this attracts the fanbois and trolls; The types of players who only cared for the KDR have always been there but were normally hidden between players that actually cared to play the game the way it was intended.
As games have become saturated and players who were dedicated to one game, now disperse, the fanbois, trolls start to come out of the shadows and are now in abundance.
That being said, we are starting to see game makers going back to team focused games and objectives, trying to recapture the old days (Battalion 1944), Hell Let Loose even BF1 where the score does not count towards the overall objective. Only COD appears to do the rinse/repeat formula that has become stale and boring.
I think the rise of Indie games may help the situation as trolls don’t normally get these as on-screen comms are not normally available; they force you to speak to people or use their own TS/Communications.
Eventually over time, these trolls may once again drop back into insignificance but I wouldn’t hold your breath.
I don’t think Clans/Communities are dead at all - there are plenty about but like ours, have become diverse with only a few members dedicated to one type of game or two. If you look at ZiiP, the majority play ARM3 and this splinters into R6, PUBG, BF1 etc. whereas some members, myself included, don’t play ARMA3 but we do play in the splinter groups.
I think you have under-estimated clans - some are rigid and desire members to play one game, there are competitive clans out there too; Jovial Clans probably exist too but may not be as abundant as before as people move on, get older etc.
In the 15 years you have been in ZiiP, games, technologies have become more advanced and rightly so. Yes, trolls are now more abundant and piss you off, like they piss everyone off but you learn to live with it or play something different.
I use to turn my nose up at games that were not from a trusted publisher like EA and Activision, I was a triple A snob. Now, I prefer the lesser known gaming house - they may not be as pretty or polished as a COD or BF game but you know that the people playing it are dedicated and play the game as intended.
Trolls are like cheaters - always been there - they will never be eradicated. You live with it and move on as your enjoyment is more important then anything they say or do.