Payment situation.
ChatGPT is the easiest to pay for from Russia. There are plenty of methods, and they all work.
Claude is also relatively easy to pay for, but Anthropic will block your account afterward.
Gemini is the hardest to pay for 😬
Right now I'm trying to figure out how to pay for Google AI Pro at least for a month, and none of the options look appealing. Even though Google changed their mind about moving my account to Russia and left it registered in Sweden, they're still very picky about payment methods.