Yep, the article is a great example of why one would use CF over LE. I think LE is worth an honorable mention given the topic, but it's not a big deal.
Cloudflare is a valid suggestion, albeit (IMO) inferior to letsencrypt in many cases. Surprised to not see it mentioned here, given that it also costs nothing, for arguably more security.
> HSBC aren't likely to be swayed by such an article.
The article is clearly aimed at small business owners. He's doing people a favor by steering them clear of HSBC. I never got the impression he was speaking to HSBC, or attempting to call them out.
> It's very easy to set up two or more business bank accounts and use them both.
This is literally second on his list of takeaways.
I've found the official documentation (docs.opencv.org) to be one of the best sources online. It goes into mathematics/theory often but presents the info in a way that you don't need it to get stuff done. I would also check out pyimagesearch.com. There's a ton of really cool projects and tutorials (mostly in python but the c++/python api are near 1:1)