You should always carefully pick and choose when you subscribe to email newsletters even though we have all in our time subscribed to some duds.
If they are a legitimate company, you, hopefully will be fine with unsubscribing , however if they are a ” spam” company all you are doing is acknowledging you are there and inviting them to send increased spam emails to you, and it will happen.
My advice is , don’t unsubscribe or you may see your inbox overflow with crap ( emails)