Hello Alessandro and thanks for your accurate and pointed notes.
I am not switching my main activity to other platforms - I just publish what has been deleted by the Quora Moderation service, so my readers, and myself, could continue to enjoy the material that would instead be lost.
About Quora, this turn of events is a rather new occurrence. The Top Writer program was well-funded and well-received, and dates back to the beginning of the platform. It has disappeared after 2018.
As for self-promotion, the Quora policy says that an answer has to bring a significant value to the community, and can include links, if they are clearly referenced in the answers as self-promotional, but unfortunately, it clearly looks like they have have a double-standard when dealing with their writers.
Even in this case, I am continuing to provide content to the platform, but this time, I am keeping reference of every one answer I give (as some have mysteriously disappeared from the platform).
Thank you for the comment and support.