This illustrates the reverse lookup problem with these services. You can take pains to use a Google account with zero contacts. That safeguards the information

This illustrates the reverse lookup problem with these services. You can take pains to use a Google account with zero contacts. That safeguards the information of your contacts. But Trucaller already has your information because they get it from other people who have added you in their contacts list, and who aren't as privacy conscious as you are.