Comment by Wikipedianon

Here's the applicable policy:

https://en.wikipedia.org/wiki/Wikipedia:Canvassing

Generally, it is unacceptable to notify people of a structured discussion in a non-neutral manner to get them to advocate a specific point of view in that discussion.

This can be applicable to notifying specific groups of people if only groups likely to have a specific viewpoint were notified.

It's also generally considered worse to give these notifications secretly or off of Wikipedia.

In this case, it would be acceptable to notify a project related to Israel and a project related to Palestine of discussions related to the Israel-Palestine conflict.

But its not acceptable to only notify the project related to Palestine.

It's also not acceptable to instruct people in your notification to vote in a certain way. r/Palestine giving these instructions is a big problem.

The fact it's "secret" and offsite also plays a role. Collaboration on Wikipedia itself shows you didn't have malicious intent, so unintentional violations usually result in warnings the first few times it happens. The fact you need to join a Discord server hidden from others is a clear signal to any reasonable person that the group is against the rules.

The line is clear and the arbitration group has banned some participants, the challenge is detecting who participated.