Are not the main alternatives a similar legal status. The difference is they are by third party providers (probably not US based) and have no relation to the ApeCoin Foundation. After all anyone can offer staking on any token. Individuals can also just connect to the contract directly as well.
The third party provider choose to geo-fence the Ape Staking website in jurisdictions where offering staking could have regulatory concerns. (Edited after correction from @BoredApeG)
Finally, there are AIPs in progress now to include other staking platforms tokens to your voting total.
FYI a Special Council member @BoredApeG is a co-author on these AIPs.