This are seo bots, this bots is to create forum accounts and drop a link in the profile and signature field. This bots can create tens of thousands of forum accounts from thousands of forum per day.
And the practice is allowed to continue, commencing since this forum's last shutdown, because...
Meanwhile, after a year (or more), a user is unable to upload or change their avatar due to a security risk that no other other forums seem to have issues with, in spite of the myriad brainiacs who embrace blockchain mechnology to help safeguard the internet which make up part of this forum's user base.
This practice is hard to stop because the bots mimics real users. This bots are using different ips can solve captcha, verify email and even verify via sms. Some advance bots has learning feature which made them adopt to new changes made on the forum or other social websites.