There is a proper way of quoting someone's reply and adding your opinion about it. A quoted text should only contain the part of the other person's message that you are specifically addressing while writing your own opinion, otherwise, it is all messed up.
An example of you not properly quoting and messing up:
Just to give you an example. There is a new blockchain project that tries to solve the problem with the scalability.
I said that I think that scalability is the biggest problem of nowadays blockchain and I hope that the project can solve it.
The post was deleted because it was off-topic?
This is just BS.
An off-topic reply can be just one of many reasons for why a moderator deleted your post. It's possible that someone reported your reply as low quality since most of your posts are bounty related. Or maybe someone found your post to be inaccurate because scalability is already being addressed by so many different projects now so it's not that much of a problem today.
I am really angry atm and I think to boycott this crappy forum in the future. This is censorship at it's best.
Either way, i respect what the moderators are trying to do with new rules and trying to reduce spam. I've had posts deleted as well but do you see me getting angry? Anyway, if you want to leave you're more than welcome to do so but just keep in mind this forum is moderated and it's a privilege to be a member. So they can delete any post that doesn't belong here because they want the forum to remain useful for many years to come.
A post can be deleted but you should be warned first, I suggest.
Picture this,
JakElips is a newbie on this forum but has been a blockchain enthusiast for a while and he identifies a problem that needs addressing; now he mightn't know that scalability is already being discussed somewhere else. [the way this forum is designed makes some topics and i don't mean boards uneasy to find]
So he thinks that his project has some potentials and then talks about it on a thread trying to get people to share what they think.
If a mod already knows that it has been discussed somewhere else, why not make it known in a reply or something so that JakElips and a few others that we should assume have never given scalability a thought can have a chance to explore. It could be possible that JakElips could take a cue or two from there to improve on his own project.
It shouldn't just get deleted without warning; think of the number of users that could have either learnt something or contribute their own knowledge to the post that got deleted. Not everyone has intentions to scam!
Now, I don't blame a mod to delete a message like that even if it is not absolutely off-topic, because it is definitely disturbing, and very much unclear and non-understandable. To avoid getting your posts containing quotes deleted, you need to learn to quote properly.
An example of proper quoting:
In any case, the problem of off-topic replies is really more a reflection on the forum's lack of threading than any fault of the users.
I agree, but since the forum doesn't yet support threading, it's necessary to enforce on-topicness to keep the forum usable.
Substantial off-topic replies are usually split.
Just read and learn. And possibly you won't need to complain after some time, if you are a learner.
but i don't know what lies ahead so its better I take the pains for something than lose all my gains for nothing. 
