Yes. I always check the link and opt-in with my email for two reasons. Firstly, I want to be certain that everything is working. Secondly, I need to reassure that there isn't anything "sketchy" going on.
Can I provide my plain affiliate link?
No, you can't.
The main goal of solo ads is to improve your overall business by expanding your mailing list. By doing follow ups with your new subscribers, you are increasing your chances of monetizing your list and building a solid following for yourself.
By sending traffic to a plain link you're never going to see those people again because they will see your offer only once.
What's your traffic quality?
All my solo runs come from +95% Tier 1 countries + a 15% over-delivery.
Udimi also filters out clicks that are worthless & thanks to my tracking techniques you will never receive the same traffic to your offer.
How fresh is your list?
My list is getting few hundred new subscribers per day through various targeted sources. Besides, I'm constantly cleaning my list.
You will never receive twice the same traffic from my services.