Appears to be open-core only https://payloadcms.com/enterprise
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In this way, would you consider WordPress to be open-core as well, considering the amount of paid plugins there are available?
I feel like a few people could be convinced that visual editing is part of the open source base product, not the enterprise plugins.
Because several of those are sold by Automattic, the company that owns wordpress, I have made that argument before, yes.