Whoever wrote that article never did programming it seems. Overall, nonsense article. I personally don't care much whether API is following or not following RES

Whoever wrote that article never did programming it seems. Overall, nonsense article. I personally don't care much whether API is following or not following REST. Yes, that's nice but not the most important thing. What I do care about is good technical documentation and Telegam API is that. It is good and comprehensive. Another point is that unlike many other services, they don't force you to use their library, but actually give enough details to implement API using any language and technology you want. Maybe this makes for a steeper learning curve. Either way, any seasoned programmer can figure this documentation out and use it.