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...
It's really sad to hear stories of people who got scammed in this industry. Many are discouraged due to this issues but personally, I never regret joining this community. At first, I already expected that there will be some "not so great" people here that will abuse other people's dreams. So be cautious especially if the deal is too good to be true. And for those who have misfortunes happened in their journey, be optimistic and continue your goal.