I live in a semi-rural area and we have crap internet options. The ONLY wired service to my house is ATT DSL. In 2020 some of the neighbors convinced ATT to sell us business accounts, which allows us to have more than 1 DSL line to the house (we got 3). Rather than run multiple WiFi networks - one for each DSL modem - at my house I wanted to bond the lines and aggregate the bandwidth. ATT won't do this for you, even though the DSL modems support it.
Along comes Speedify (https://speedify.com). For around $130 for three years you get a service that allows you to multiplex an arbitrary number of lines. Many people would use this, for instance, with a laptop if they have