ComfyFactorio/modules/no_blueprint_library.lua

local Event = require 'utils.event'

local function on_player_joined_game()
    game.permissions.get_group('Default').set_allows_action(defines.input_action.grab_blueprint_record, false)
    game.permissions.get_group('Default').set_allows_action(defines.input_action.import_blueprint_string, false)
    game.permissions.get_group('Default').set_allows_action(defines.input_action.import_blueprint, false)
end

Event.add(defines.events.on_player_joined_game, on_player_joined_game)