I don’t think it’s necessarily a red flag for the person getting the tattoo but it is for the company.
I have a few tattoos. All of them I mulled over for >1yr before I went through with it. I definitely wouldn’t do this. There’s others I know who are coated in them and getting another isn’t a big deal, just a bit of fun.
Some people in related threads are getting moralistic on those receiving. There are people who don’t value the space on their skin like others and it’s not a big deal or even, a fun story.
Regardless I disagree on the above that this isn’t inventive. I haven’t heard of this and there’s posts popping up talking about this company. I wouldn’t want to work for them but there’s clearly some that would. It seems like it worked for them.