How accurate is the suggested level?

Practice has shown that this rating maps quite accurately to the commonly accepted titles and categories. But the best accuracy is reached only where a community (for example, a Telegram chat that our bot was added to and where games are registered) has existed for a long time and actively records results.

At the very start everyone begins with the same rating, and it takes time for the ratings within the community to balance out. An indirect sign of a "balanced" community is that the top players' rating has stopped growing (provided they play not only among themselves). Until then the suggested level will be understated.