This doesn't prevent hotels you've stayed at, car dealers, utility companies, banks, ISPs and others from selling your data.
Also, in Russia (and many other countries as well) you cannot legally buy a SIM card without an ID. And Digital Ocean doesn't accept some virtual debit cards and suggests that I use a real credit card (so that they can charge me even if I don't have money).
So, don't use Digital Ocean? They are far from the only fish in the sea[1]. Vultr stands out, they offer Bitcoin and WeChat Pay as alternative payment options to the usual Paypal and credit card methods, and they have an awesome ISO library that includes OpenBSD. They aren't the only provider with those options but they are my go-to.
Also, in Russia (and many other countries as well) you cannot legally buy a SIM card without an ID. And Digital Ocean doesn't accept some virtual debit cards and suggests that I use a real credit card (so that they can charge me even if I don't have money).