a Newbie welcome message with a warning would surely help for the few real "accidental" cases.
In OP's case, I think he (she?) can be a contributing user, and I don't think they'll plagiarize again after this warning.
I think this kind of information is very important for novices, at least make sure that the following articles or one of them can be read by novices when registering.
Unofficial list of (official) Bitcointalk.org rules, guidelines, FAQNewbies - Read before posting[TIPS] to avoid plagiarism[GUIDE] Plagiarism and how to avoid it.As the number of people in the forum increases, it may be inevitable that some small groups (groups of like-minded people) will form.
I want to ask if there is such a group in Bitcointalk to join.
Yes, there is, AFAIK, there's someone making a thread about the
Gangs of BitcoinTalk 
.
Let me name it here their gang name.
- Foxpup Merit Cycling Club
- The Thick-Skinned Gang
- The Nullian Cult
- The Clowns Cartel
- The Mods Gang
- The Wall Observer Gang
- The SpamBusters Gang
- The Scam Busters Gang
- The Collectors Gang
- ..and etc. just check the link above
Or there are outside forum groups like Telegram and Discord, you can choose where to join and by the way, welcome to Bitcointalk. A Bitcoin community where talk about Bitcoin and crypto stuff in general.
I asked this question a few weeks ago. There must be some members who are interested in each other in the forum that has lasted for more than 10 years, thus forming small groups.
LoyceV's Avatar for Rent [first 🦊🦊2 YEARS🦊🦊 (122 weeks) rented out]I almost finished reading this post, it is always interesting to read old posts. In addition, the time machine is great.

Don't know how long it will take me to join. lol