I posted a poll on Twitter some time ago, and asked this very question:
What is better - Free or Free Trial?
And the results were quite clear.
Looks like a completely Free, standalone plan, is beneficial for getting users, show and create value without friction, and make your product as best you can to upsell.
So I removed the Free Trial, and left a completely Free plan with everything you need to get rid of all spam for good.
Check it out here š
https://sentrya.net
Do you have a Free trial or a Free plan on your service?