Changes made by users to profiles are stored in a log, at least I think so. I don't know if the administrator will be able to give access (even partially) to those in charge so that they have some control over which users change their signature and avatar for a few days, something I have not seen so far in this forum. In any case, it is best for managers to make a suggestion if they are interested in having more information and if they do not have tools that can do the job.
@PX-Z has said that he will do something in the future about this, let's wait to see what the administrator says and we will have clearer ideas.
You are right, the log is there but that's only for admin as you aforementioned but on BTT members have made such tool to keep track of the log system and it has slipped from my mind thanks for bringing it in front of my eyes. Well, many members are still abled to scam mangers by wearing two signatures at a single time and being able to get payment of two campaigns. That's awesome and shit both at the moment hehe.
Well, I know no such case has been recorded here, and thanks for providing the information about PX-Z's contribution. He/she is doing great work, I am glad we have such useful members here who are dedicating there time to the forum, he is also very active on BTT and contributed there not at a big level as here but still contribution is a contribution.
To be honest I am motivated by his actions a lot and planned to learn some relevant skills but before i have to complete some things than I will invest my time on this skill.