This "legalized plagiarism" as you put it is the lowest of the low - the absolute minimum amount of work needed to make a post which will be paid by a bounty and won't be deleted. My concern would be that if the Press board is more strictly moderated or locked, then these spammers would simply move to another board.
It's only really there because it's pretty much the only board where you're legally allowed to get away with it. It's a board where essentially plagiarism is allowed as long as it follows the Press format and that's why people have taken advantage of it. Remove it and I doubt people will just start posting it elsewhere. If they do, they should probably be warned and then temp banned, especially if all or most of their posts are just press or promo articles. At the very minimum some restrictions should be put in place and I think enforcing the
notable Press hits clause should be applied ie no crypto-related sources.