It's possible they are doing such a thing, however I also am sure there are many legitimate users in the comments. I personally have been using them on the free

It's possible they are doing such a thing, however I also am sure there are many legitimate users in the comments. I personally have been using them on the free tier for over 10 years. I signed up soon after Microsoft was stopping allowing you to use your own email domain through Outlook at a free tier. Zoho allowed you to use your own domain name for free and even has support for things like IMAP. The current free tier is a bit more restrictive now with features like IMAP being removed, however they have never removed any features from my account. I personally find it hard not to be loyal to a company who will grandfather me in on a less restrictive free plan. I haven't paid them anything, they technically owe me nothing. However, while I have not made use of their paid services (as I use it just for personal use), I have referred clients before to Zoho when I have been working on their websites. I've also made use of their invoice software free of charge to generate a couple invoices and have been quite pleased with that as well. Sometimes when companies are fair to their customers either via pricing or business practices, it results in people being much more willing to go out of their way to say good things about the company. It would be insane for me to be negative against a company that has provided me a good product for free for years upon years. There aren't even ads.