Snowflake acts as an entry point. A lot of official TOR entry nodes are blacklisted in some contries. Since Snowflake can run basically behind any IP anywhere where a browser is, it is hard to block them. In that way users in suppressed countries can still access the TOR network through Snowflake but the official entry nodes.
I really like this feature with BetterDisplay on my MacBook from work - and now it is coming to Plasma, too - that’s great! :)