Getting an old Computer online with Android Ethernet tethering

I enjoy playing around with old computers and software from the 90s and early 2000s. My childhood computer was the Amiga 500 which I still have and which I love dearly, but the Windows 9x/XP era of computing is the most nostalgic for me because this coincides with my teenage years and my early 20s, and there are just so many great things about it; 3dfx games, the early internet, Napster, ICQ, Winamp... it was a fascinating time in tech. One problem with computers from this time period is how to get them online. They either have no wifi or severely outdated wifi modules which at best do WEP encryption, but they can't connect to a modern WPA encrypted wifi network. So in order to get them online you would either have to downgrade the security of your wifi network (terrible idea), set up a dedicated wifi network for these machines with only WEP security enabled (also terrible) or connect them via ethernet, which is easy enough as long as you have an Ethernet connection available. But…