Please God get rid of them. It's not like they actually provide anything substantial to SL rp. Want someone to talk to while you RP all alone? Get a summon. Sure people will just move on and try to fight for items, but no one is under any kind of obligation to accept challenges for them, and as far as I know they cannot be tracked.
Eventually there is only going to be one person left who plays with Biju, and then they will claim the ten tails. Sure, that might be cool on paper, but when the guy who has it is a dickhead and actually uses powers that will kill you, it won't be fun and will cause arguments. Nothing good comes from the Biju. You can try and convince yourself that this is almost entirely OOC, but when the Ten tailed Jink comes knocking at your village gates you will be eating those assumptions. Might as well chop off the infected limb now before it spreads to the brain.
It's not like the power boost from the tailed beasts actually amount to anything in the canon. In the Naruto vs Sasuke fight, Sasuke was still able to keep up with nearly everything Naruto did when in Kurama mode. It didn't even look like he was moving any faster or slower when comparing their combat before and after the cloaks activation. In the Boruto movie Sasuke was moving at the same Pace Naruto was, if not arguably faster during the final fight. The power scaling was thrown out the window during the end. So either A.) Remove the beasts entirely, or B.) Remove the concept of using their chakra to make your stuff stronger.