Being different than other mixers is valid excuse not to offer Letter of Guarantee. For example ChipMixer does not offer LoG because it is incompatible with chip withdrawal idea. It would be nice to have an additional security measure but sometimes you just cannot do that.
Exactly. ChipMixer doesn't offer a LoG because it's incompatible with how you guys work
AFAIK, BitMaximum works exactly as the other mixers. Send to X address, receive in Y address. So I don't think the "I don't want to copy the other mixers" excuse is valid when this would benefit their users.
For me, the main thing is that the functionality of this mixer really covers its tracks and allows you to safely withdraw your earnings from the crypto-currency market without any traces.