they say rate limiting which somewhat makes sense but they should just offer payment instead as rate limit, you can use nostr:nprofile1qqsxp4fkwhc8mm5704mezrh6g35zmp7t2v338wnxhr6yf8tyj9ezj6cprfmhxue69uhhyetvv9ujummjv9hxwetsd9kxctnyv4mqz9nhwden5te0wfjkccte9ec8y6tdv9kzumn9wsa5dz6k or hushed as signup number