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Well  -  they do give 220 ohms of  CM,   and   440 ohms of  DM  attenuation,  and limit the turn on surge current to C1 to under an amp.

BTW  this circuit is illegal in many countries as it may draw more than 5mA ave  DC from the mains supply,  causing local earth stake corrosion  -  so read up on standards in the countries of sale !    Better to have a bridge rectifier any how

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RF1  is of course dumb in this context and is likely a thoughtless " copy over " from another design

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oh yes   -  D1 can see > 750V pk  -  another good reason for a bridge.

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L1 needs to be rated for > 400v  end to end  -  most cheapies aren't  -  they go poof after a while  . . .