I can’t claim it to be 💯 trustworthy due to how the keys are stored (and that is applicable to many nip07 extensions), but it works and I use it. Also, you can just create an account and don’t pay an invoice, verifying using the DM. And most of the clients support Nostr.build out of the box so webpage uploads are not required at all. It is only in rare cases where you’d need to upload using the webpage.