Not sure what you mean by "they are good to be a user only."
Whatever their strategy is, this is great for the community.
If that were the definition then any software you can install on your computer would be open source. It makes open source lose nearly all meaning.
Just say "open weights", not "open source".
Strategy of FB is that they are good to be a user only and fine ruining competitor’s business with good enough free alternatives while collecting awards as saviors of whatever.