Probably the parting of people with different opinions into multiple factions. If certain people disagree with how bitcoin is moving forward due to different opinions on how things should work, they split off and fork bitcoin. A perfect example of this would be the big blockers, whereas they forked off and created Bitcoin Cash(BCH). As bitcoin moves forward, there's definitely going to be more of this. With a decentralized system, there's no centralized authority to make the decisions hence the splits in the community. I think this is both an advantage and a disadvantage
That's only true for the very first years of a project when it's still immature and not well-developed
I think Bitcoin is already past that. Obviously, you are going to tell me about Bitcoin Cash and a host of other Bitcoins. But if we cut the crap, people who created these shitcoins were looking for getting rich quick, not for making Bitcoin any better, whatever they may say to the contrary.
The block size debate had been ongoing since 2015, if not earlier. Bitmain, Roger Ver and others had loudly supported previous efforts to increase the block size with a hard fork (XT, Classic, Unlimited) with no intention of a network split. So, it doesn't seem obvious that it was just to get rich quick. "Hard fork dividends" became a thing in late 2017 but before the Bitcoin Cash fork, nobody knew what was going to happen. An adversarial split (like ABC vs. SV) could have just as easily crashed prices and lost lots of money for the forkers
But let's admit that the moment for the Bitcoin Cash fork was an extremely fortuitous one
And the folks you mentioned (Jihad, Ver, Craig) had likely made millions with this fork. The last split, though, looked more like a typical family quarrel which had nothing to do with either technical issues or profit considerations. Most likely, it was caused specifically by the lack of profits (quarreling over last crumbs of the pie) just like the Bitcoin Cash fork was caused by the anticipation of them. These dudes are in exclusively for money
If Bitmain really wanted to get rich quick by propping up an altcoin, they probably shouldn't have forked Bitcoin -- they gave Bitcoin holders millions of free coins to dump on the market
It is the end result that counts, and in the end thousands of these people became bagholders. While Bitcoin may make new heights, in a year or in a decade, Bitcoin C(r)ash (whatever color) is likely to kick the bucket in the interim