The issue is that people won't use my stuff because the licence is viral and requires them to relicense just to use my code, even if my code is 1% of their code

The issue is that people won't use my stuff because the licence is viral and requires them to relicense just to use my code, even if my code is 1% of their codebase and they spent years of tedious effort making their IP. To me this is an onerous requirement. On the other hand, if they take my code and make some changes to it, and then sell access over a network, I want those changes to be brought back upstream. So to me, something like ALGPL (does that exist?) or A-MPLv2 would be ideal. Then again, I mostly write computer vision pipelines, which are very much on the library side.