One time 5k btc or step by step? I bet you'll know answer after think a bit about this question   You know nothing about person running mixer, so good, that you personally don't have a scam cap, but we talking about chipmixer.
I got an answer, so we can't prove and should just rely on some anonymous person running mixer who can simply not answer for few days if something went wrong with service. If they have enough money, why support is so poor? Hard to hire few ppl? Lol.
I don't have any 'magical' suggestion, project is not opensource or so, it's business and problem should be solved by creators of service, not by me or community, i'm not getting money from it or any profit. I just pointed to obvious problem which allows mixer operator do whatever he wants w/o being catched.
And you already agreed that the problem exists, good that they have a lot of trust here, but it's still coin laundering anonymous service running by anonymous person, don't be naive, any personal problems (family problems or so) can force him to scam some deposit and you'll not able to prove it, anything can happen and customer should be protected from it, or, at least, prove that they were scammed, with current service site they can't do it.

So we returned to my first question: how should i prove that i deposit to you if you'll silently change deposit address? Who will be more believed on this forum: newbie lost money or mixer running signature campaign for 2 years? Answer is pretty simple, that's is why i'll never use that, nobody knows what is your cap of money for exit-scam.

Every mixer has it, you can talk everything you want about it, but if someone deposit enough coins for your life you'll close doors or just scam deposit and keep working, because it's not possible to prove that deposit address is yours.
If you're really respectable service your must solve it and it'll attract more customers. But for now is just based on fake trust that you're will not change deposit address - not enough.

It's not fake security, it's just a protection from multiscam, in case i'll get scammed by chipmixer i can prove it to protect other ppl form using scam service, but current chipmixer site doesn't allow me to do that, they can scam money easy and just say that i deposit to wrong address covering it by "reputation" in this forum.

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.

You didn't understand my proposal, there should be 2 letters for this type of mixer (private keys based), one before deposit - one after. First letter prove that address generated by chipmixer, second one - private keys.
You still didn't answer: how should i prove that address generated by chipmixer in case they'll silently change it after large deposit?

In this case Letter of Guarantee should be a proof, that generated address regarded to chipmixer, nothing more needed (i'm talking about before deposit step).

Strange that this mixer doesn't provide letter of guarantee BEFORE i'll send coins.

If means in case of selective-scam (large deposits) nobody will able to prove that address really regarded to chipmixer.

holy shit TS can you stop talking about anonymity and other shit you never able to follow?
this mixer still unsecure and uses cloudflare, they provide all IPs and information to US and other authorities, enjoy the game.

Name Server: BETTY.NS.CLOUDFLARE.COM
Name Server: LEX.NS.CLOUDFLARE.COM
bitmaximum.io [104.18.54.54]