Why do the IPs of some routing nodes change dynamically?

Support Relay Operator
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1.Why do the IPs of some routing nodes change dynamically? For example：
In 2022-10-24-00-00-00-consensus file, the IP of the node named EinfachOhneNamen is 91.40.121.88.

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But in 2022-10-24-08-00-00-consensus file, the IP of the node named EinfachOhneNamen is 91.40.113.252. They belong to the same /16 network segment.

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  1. Currently, many countries prohibit access to Tor, such as China. Do you have any good ways to use Tor to access websites in these countries?
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Must be dynamic to avoid begin be traced back ?