If it's not illegal to add, the only risk is bad press coverage, and it might prevent someone from suing in the first place because they don't know their rights.
In the United States where TikTok is based, contracts can include "severability clauses" that state that in the event any part of the contract is deemed unenforceable, the other parts are still good
IANAL; However Usually the contracts have a severability clause, meaning even if some parts of that contract are null and void the rest of it stands minus the parts that are illegal. Does that mean those clauses are also null and void depending on locality? Again IANAL, but I believe it's pretty settled contract law at least in the US.
We need legislation to fix this. Something like "should a contract drafted by a lawyer include clauses that they knew or should have known to be unenforceable or void, the entire contract shall be unenforceable by the drafting party"
to cover their asses. It's like seizure warnings on video games. it should go without saying but. sadly...it has to be said. if a case does arise, judges usually create a 'quasi' contract that's usually modified to be fairer for both parties...usually...😬
I'm guessing this might be a pre-emptive response to all the Snapchat lawsuits. Basically, parents are suing Snapchat because their kids talked to drug dealers using it.