Yeah, if there's a multiverse where all possibilities play out, and if any universe can directly affect another, then there's an infinite number of universes that do affect or get affected by others and there's an infinite number of universes that don't.

Just like time travel with multiple timelines. If you travel back in time, you're splitting off at least 3 timelines. One is the original where the past remains unchanged and you timetravel, one is the original where the past is the same and you fail to timetravel, and one is the original timeline up to the point that you travel to, at which point it diverges probably very drastically (which makes me think that traveling back in time will be a one way trip because your original timeline won't be very close to the new one's future). Though if you can travel back to the future, there will be one version where you never do to pair with the one where you do.

Though I'm not holding my breath on any kind of direct influence between universe and timelines other than maybe something like gravity from one can affect others, and really don't think that traveling from one to another will be possible. But who knows what is really possible, as advanced as we might be compared to our past, I wouldn't be surprised if our knowledge is still just a drop out of a whole ocean.

are u saying that all those who up voted the meme, did it just bc they didn't understand what they were reading? tbh i didn't even understand the first sentence you wrote. That means you must be very smart. Not sure if i will up vote u

A multiverse is made up shit and there's no set of objective rules about what can and cannot be.

Unless you have some official document of multiverse rules produced by someone who isn't just making shit up (i.e. Marvel).