It's something I've learnt to live with. I cross-post to other websites (including my own) that allow copy and pasting. I wanted to set up my site so no one could copy and paste, but I don't know enough about programming to do it and didn't want to download another Wordpress extension. Apparently, you need to limit Wordpress extensions for security, I'd rather someone copy a chapter then lose access to a website I paid for.
If someone wants to steal it then go ahead I have plenty of proof it's mine, and they don't know my end game. Hell, I don't know my end game. I'd kind of even be okay with someone translating the free version of my stuff into a different language, it's not something I'd ever be able to do myself (seriously if you do this, please give me credit).