Yeah, it's not even niche topics, it's almost everything outside of technology. Almost all of the creative communities I used to follow on Reddit have practically no associated activity on the Fediverse. None of the photography communities have really picked up on Lemmy/Kbin either.
There's some photographers over on Pixelfed but finding content or accounts to follow is pretty bad. I follow maybe a handful of people whose photos I like to look at, and the only mechanism to find good noteworthy accounts is the trending section - which I check daily but it's mostly the same handful of people everyday. Scrolling to the public feed or trying to follow generic photography hashtags mostly nets me memes, porn and random pics which aren't photography at all.
I stopped going to Reddit as much, came over here, after a few weeks I'm not using this as much anymore either, so I'm mostly trying to do more useful things with the time. Though I'm sad that I've lost a few communities in the way.
The poorest are already not travelling, sure, but making travelling even more expensive is going to stop a whole lot more people from doing it.
And it's not that flying prices "can't be touched", it's that touching them should come along with creating alternatives, but that mostly doesn't happen in my experience. In Portugal, gas taxes have increased over the years and a carbon tax has been added on top of the already existing ones to incentivize other means of transportation. The promise, years ago, was that this would also help the state fund public transport. That mostly hasn't happened. New transport infrastructure is mostly only built around the couple of cities where transports were already fairly good and the rest of the country just gets continually shafted. Just last week some study popped up on the news that there's more people in Portugal simply not going anywhere on their vacation.
With the rise of accommodation costs in Portugal, driven by everyone from richer countries in Europe seeing us as their big beach, and with how expensive transports are, it's often cheaper to fly to other European cities and then use their transport infrastructure than picking a local destination. When I want to travel, I book in advance, take the cheapest flight and backpack only so I don't pay any added taxes. I do it out of season and to places where accommodation is cheap. This is very common for people my age, at least in my social group. If flight prices in Europe get much more expensive, I'm sure it won't affect many but the absolute poorest in France or Germany, where the minimum salary is what a top 15% earner in Portugal makes, but a lot of portuguese people will certainly travel much less.
Again, though I understand the emergency of fighting the climate crisis, a bunch of climate measures coming out of Europe often feel like the rich countries shafting us - and shafting the poorer overall - without coming up with any alternative. It feels like European legislators - and even europeans in general - think that the whole of Europe is France or the Netherlands or other countries where if you ban flights entirely or come up with yet another mandatory tax that make gas absurdly expensive people can just get on one of the cheap trains going by every 10 minutes - but that's not a fair representation of all - or even most - of Europe.