You're probably right, yeah! In that case probably one of the other commenters' suggestions would be a better choice, I think. I'm hoping the pixelfed stuff will catch on enough that at least some instances will be more likely to stick around, but it's anyone's guess if that happens.
This actually brings up another question for me! Say your account is on an instance that doesn't allow something, like nudity. If you subscribe to a community on another instance that DOES allow it, you're saying that everything you see there does end up (redundantly) hosted by your home instance. Has the Lemmy moderation/admin community in general decided on whether or not that's breaking the home instance's rules?
If you wanna stay in-fediverse, you could post the pics on a Pixelfed instance and use that as the host. Just post the pic there, copy the direct URL to it, put it in the URL bar in a post here and it will show up as a normal picture instead of a link. Also Pixelfed allows unlisted pics, like if it's stuff that would clutter up your profile.
You're probably right, yeah! In that case probably one of the other commenters' suggestions would be a better choice, I think. I'm hoping the pixelfed stuff will catch on enough that at least some instances will be more likely to stick around, but it's anyone's guess if that happens.