Completely agree. It is a loose coalition of all different kinds of left-wing groups and activists. It’s fluid, changes all the time, and there is little or no oversight to make sure that everybody who says they’re affiliated is following the purported guiding principles of the group.
I personally avoid joining groups and movements in general. I’m even suspicious of many Catholic groups, or groups endorsed by members of the Church. It’s too easy for them to go way off track. In the US, where individual rights are emphasized, one can certainly stand as an individual for principles of peace and justice and lives mattering, without needing to march under the banner of some movement. Many such movements end up being about getting power and attention for their leaders rather than getting justice or positive change for the people.