By definition, people with a conservative mindset are less open to change and new experience.
Federated social media is still in the new and formative stage. So it is not shocking it is still dominated by those more open to new experiences. But don't be surprised if that shifts if/when Lemmy/kbin reach critical mass.
Came here to say this. The most literal definition of the word conservative in the context of the party is "to conserve old ways". They are resistant to change by definition.
Leftists use change as a tool to try to make things better. They're naturally more likely to embrace something new.
Although I find it odd that conservatives today tend to have the most radicalized agenda out of all - yeah I mean there are some outright communists, but their numbers are like at most single-digit population percentages, whereas in the USA and UK and Russia and such they pretty much are the majority of people (hehe, in Russia the votes somehow outnumber the population even...:-P).
i.e. at one point they were conservative, and they still claim to be, even while wanting to change e.g. from a voting democracy to a totalitarian regime. But it changes every couple of years so it's really hard to keep up - e.g. in the USA GW Bush was an actual progressive (like, feed poor people), but then came the Tea Partiers, ousted by the Alt Right, which is no longer considered extreme enough and on and on it goes... (as the song continues: where it will stop, nobody knows:-).