I can't tell how reputable the exchanging services are, but they aren't many on the list.
They aren't reputable at all - Cake Wallet partners with KYC scammers:
https://x.com/Kruwed/status/1869564255080718626https://x.com/Kruwed/status/1924628783929123217
Cake is the first wallet with support for Paycoin V2 but I hope to see more wallet in future.
No they weren't, that's just a lie that SethForPrivacy told - https://x.com/sethforprivacy/status/1869112595652989074
BullBitcoin's wallet was the first to implement Payjoin v2 - https://x.com/francispouliot_/status/1873047834712518884