This is a money question not whether they have an actual case of TM infringement. I dont see them filing a TM infringement case.
What they probably will do if you dont respond is they will spend $2000 and get a UDRP action filed. If you dont respond to the UDRP action you will lose the domain.
I believe that if you do spend the money to respond you can actually keep the domain, but it depends on what you have done with the domain. Now it redirects to a tube. Was it used for a dating site at some point? Was it redirecting to a dating site ? Did they try to buy it from you and you demanded $5000 to sell it to them?
There's an analysis that is required that cant be made based on what you have shared and you shouldnt share on a public forum.
So if you want to keep it your going to need to at least respond to the UDRP when it gets filed. You can do it yourself or you can hire an attorney. Its not difficult to respond to a UDRP and its not expensive but the question is what is the domain worth to you.
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