After a quick look on some threads, it looks like some people also allows payments in altcoins. And since wBTC is an altcoin, why not? As long as both parties agree to transact with wBTC then there's really no problem with it. I mean, you could even transact using crappy altcoins if you want and I wouldn't care as I'm not involved anyway.
I have seen threads getting trashed or moved to Marketplace (Altcoins ) section or its sub-sections if threads are offering or seeking services only in altcoins. Threads are allowed in 'Service' section if part-payments are in altcoins. At least some part of the payment has to be in bitcoin to qualify for the service section.
By the way, why do you want to use such tokens on ETH network? Bitcoin transaction fees these days are usually lesser than the ETH network which is more or less remain congested due to DeFi transactions.