If you haven't verified the source code, then you need to trust the people who have written and studied the source code. Allow me to not trust liars with my privacy software.
So you only trust Chipmixer (who scammed everyone), Whirlwind (who scammed everyone) and Mixtum (who said they will confiscate your deposit at any time for any reason without assuming any responsibility whatsoever):
2.1. Privacy Policy
Please refer to our Privacy Policy to get an understanding of our confidentiality obligations. You consent to the collection and use of information as described in the Privacy Policy.
2.2 Suspension or termination of services
Mixtum reserves the right to suspend or terminate access to services at any time at its own discretion, with or without reasons, with or without notification assuming no responsibility whatsoever.
For example, services may be suspended or terminated due to the following reasons:
an actual or suspected violation of these Terms and Conditions;
use of the service in such a manner that is conducive to the legal liability of Mixtum or Service malfunction;
planned or unplanned maintenance, etc.
2.3 Unacceptable use
You agree that you personally will not commit, encourage or support the committal of:
use of any unauthorized means to access the Mixtum service or use of any automated process or service (for example, spider, crawler or periodic caching of information stored or generated by Mixtum) except for the functions described in our API, as well as distribution of instructions, software or tools with this aim in view;
modification, change, distortion or any other interference in work of the Mixtum service;
disturbing or interference in operation of servers or networks used by Mixtum to deliver the Services;
disabling, overload or degradation of Mixtum performance (or any other network connected to the service);
use of the Mixtum service or website for any other purposes other than those specifically provided by these Terms and Privacy Policy;
any illegal or fraudulent activity, as well as use of this Service in order to legalize illegal income, financing of terrorism, participation in schemes of phishing, forgery or other such falsification or manipulation;
unauthorized spamming, pyramid schemes or any other activity duplicating unwanted messages should they be commercially oriented or of other nature.
2.4 Service updates
At any time and at its absolute discretion Mixtum can carry out unscheduled works related to the service modification, update and enhancement. We are liable to add or remove functions and cease activities of the service and website.
2.5 License and restrictions
Mixtum provides you with a personal nontransferable nonexclusive license to use the Service as it is stipulated for you by Mixtum. This license is provided under conditions and restricted to the provisions, stipulations and constraints stated in these Terms. Therewith, such license is intended for personal, noncommercial use. You may not copy, modify, create a derivative work of, decompile or otherwise attempt to extract the source code of the service or any part thereof, exclusive of data permitted by law, or expressly allowed by the Mixtum platform (use of templates, API, etc.). You may not reassign (or grant a sublicense of) your rights to use the service, or otherwise transfer any part of your rights in accordance with these Terms. These Rules do not provide you with any license or permission to copy, distribute, change or otherwise use any applications programming interface despite any provisions to the contrary. No property rights or ownership rights related to the Service are not granted to you according to these Terms. Mixtum reserves all rights that have not been expressly granted.
What "lie" was told that makes you prefer Mixtum's hostile terms instead of using open source software?