But you can remove such restriction by writing in details to a bot which get reviewed later by a human support member.
I actually have two Telegram accounts, one of the account got that limit problem and I send details multiple times to the bot so I may get that ability again but man their support team is quite weak in that department as well.
I hope Thormixer users that use Telegram for mixing purpose may not face such issues. Even if they do, they can still go to Thormixer's main site and complete the mixing there without any issues.
A limited telegram account shouldn't in any way, get on or in the way of a user who is using the Thormixer telegram bot for mixing their bitcoin instead of the site, and this is because limitation to a telegram account only is effective in chats, either groups, or private chat (thought I mentioned this on a previous comment I posted here), you lose access to participate in majorly all group chats excluding your own groups, and you also can not send a private message to most people except they contact you first.
All this does not affect the use of bots, limited users can still interact and use bot to carry out the task the bots are specified or designed to carry out, in the case of Thormixer, a limited telegram account can only be a concern if the user encounters an issue and needed to contact a Thormixer rep on telegram, but then, there are still alternatives right? And even this forum is one of such.