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I can say with absolute certainty that it is not the case. First thing that comes to mind is the send buffer size; I think it was 8192 Bytes or something on Windows by default, at least on 8 and 10. Adequate for DSL, too little for Fiber. In Eddie, set the send buffer in Preferences > Networking to 512 KB and reconnect. Second thing that comes to mind: Did you verify that the port is indeed open? If only upload is affected, maybe you don't get enough incoming connections?

This is no support forum for Gluetun. A lot of questions have been asked and answered already regarding DNS_KEEP_NAMESERVER=on, resolv.conf and 1.1.1.1. https://github.com/qdm12/gluetun/issues/1443 https://github.com/qdm12/gluetun/issues/1523#issuecomment-1673998852

In Wildcard mode, * means any. *testufo.com would block everything that ends with testufo.com, but not testufo.com itself because * implies there is something before that. It would block abc.testufo.com and also things like abc.123testufo.com and 456testufo.com, but again, not testufo.com itself with nothing before it. In order of suitability: Ends with mode, .info. Wildcard mode, *.info. Contain mode, .info. The other modes don't suit your use case; they work quicker but require an actual domain name. Though, maybe Domain mode, .info could work as well, unsure.