

There have in fact been huge discussions of this in the past, which maybe you’d already know about if you didn’t come in hot mouthing off about how things need to be changed to fit your preferences immediately, chop chop!
Turns out the type of blocking you want requires a great deal more code than you (clearly) can imagine in order to be actually functional, as opposed to a fig leaf requiring the full cooperation of every server involved.
This was discussed ad nauseam maybe about 5 years ago, with long hellthreads in microblogging fedi, complex deep-dive technical blog posts, the whole nine yards. No I didn’t save links and I wish I had because this and related issues (Mastodon’s fig leaf “privacy” settings, E2EE DMs) keep coming up.
The answer is that what you are asking for can either be implemented as a porous fig leaf which falls apart the very first time some asshole spins up an instance which doesn’t respect it and vacuums up your posts en masse, or it can be implemented using cryptography which requires an enormous amount of work by extremely well-educated CompSci types to implement a standard, and then implement code libraries, and only then can the developers of platforms like Lemmy and Mastodon get started on implementing the actual feature. No one is paying anyone to do this, and it’s not clear that people with the necessary expertise are even available to develop the standard and the code, nor is it clear that everyone would adopt it if they did. So up til now, it hasn’t been done.
In the US, many laws have been passed, and more proposed, to punish entities who boycott Israel. Entities being individuals, corporations, cities & towns, etc.
And you know what I say to that as an American? I will boycott whoever the fuck I please, whenever I please, for any reason or none at all as I see fit. And if corporations are people too, my friend, then they have the right as well to self-determine who they’ll buy from and who they won’t. And while we’re at it, so do municipalities, and private clubs, any other collection of people singular or plural.
I find such craven obeisance in service of Israel to be personally offensive, and any American who pays attention to how Israel actually behaves with their own two eyes is likely to come to the same conclusion if they are confronted with the issue and think about it for five seconds.
Anyway, that may be a factor behind loud support of boycotting Israel from random American leftoids.