It's probably their own way of honoring Bitcoin or the Genesis block, the starting point of everything running right now. Of course, you can't do that if you don't have much. So, yeah, the ones who did it are indeed filthy rich, but it's not necessarily showing off. Nobody knows them anyway.
If you have many bitcoins that you got easily in the past, you can donate it to Bitcoin Genesis Address, that can be considered as burn. It's similar to Bitcoin donations to Bitcoin forum years ago, and these donations are appreciated.
The last donation to Bitcoin forum is from Claymore years ago.
Thanks to Claymore, the first Donator in quite some time.
Or, I hope not, these could be erroneous transactions.
I don't note Bitcoin genesis address in my wallet or my device, and I think there is zero chance for me to make an erroneous transaction like this. It is intentional transaction, but we only don't know reason behind this.
2 bitcoin is a lot of money, a fortune with many people and nearly zero probability of making mistake with big transaction like this, especially sending it to Bitcoin Genesis Address.