Lot is for patent holders to commit their patents to the group and everyone gets a license.

Rpx is probably the closest thing. They will try to kill a patent if it is being used against their members. But they don’t cover the cost of litigation.

There are also patent pools where everyone pools their money to buy a certain patent.

There may be some insurance you can seek out. But I don’t know if anyone in the space that is using that type of thing