How much does it cost to use FSL?
FSL is free to use, and it costs $0/m. There are some limitations, though.
Will you introduce paid plans?
Perhaps in the future. Currently, there are no paid plans.
But, there must be a catch!
If you're using a free product, you are the product!
No. Free plan is really free, and there is no hidden agenda - we don't and will not use any of your data in any way other than to associate your links with your account and include the numbers from your links in global stats (number of clicks, number of created links).