Very good comparison, as always from PrivacyTools (nitrohorse).
Non-Profit: Compare e: corporation structure with many staff, some payed. Versus Disroot, or PrivacyTools, where nitrohorse is a member: loose volunteer groups asking only for donations to cover expenses. E buys phones low, and sells higher for profit. E buys storage and cloud services low, and sells higher for profit. “Corporation in Public Interest” is not same as non-profit.
Onion site: In desktop torbrowser see “.onion available” in address bar. Example: searx dot space, but not always seen.
user agent of the browser: So they know Windows users on Firefox are curious for X, Linux users on Torbrowser are curious for Y, so when these visit your websites, show them advertizements for Z and T. As groups not individuals.