A lot of websites can be static HTML + CSS.

Yeah they can, I can understand you might want to use something like php to not need to edit the footers and headers every page if you ever change them, but still.

I also like how some websites like Amazon.com refuse to add a payment platform which is more than a credit card checkout. Especially because their EU sites do have payment platforms with more options to pay. So then you have an over complicated site already with a lot of bloat and some amount of your consumers can’t even pay.