Interesting question, I know. For me personally the answer is no - I have not ever regretted having gotten into bitcoin, despite having spent hundreds and hundreds of hours researching the topic. It's always been an interesting ride.
But I have a friend who got scammed and he regrets having had anything to do with crypto in the first place. It's pretty sad but there's nothing I can do about it. I even offered giving him half of the amount he lost from my own crypto stash (mind you I am not rich) but he's so scared that he's not interested any longer...
Wow! your such a good friend, I wish I could have a friend like you in real life
But honestly, as I can see with your friend I can't blame Him for what decision He made, you maybe right that He might be thinking
that through crypto he could become rich instantly, and it didn't happen instead He lost a huge amount of capital. But if you're friend
decided to be here in crypto with full determination and dedication for sure He wouldn't say that things believe me, perhaps til now He would
say no matter what how many times I fail I won't give up of being here in crypto. That's in my opinion.