I ask this because I think of the recent switch of Ubuntu to the Rust recode of the GNU core utils, which use an MIT license. There are many Rust recodes of GPL software that re-license it as a pushover MIT or Apache licenses. I worry these relicensing efforts this will significantly harm the FOSS ecosystem. Is this reason to start worrying or is it not that bad?
IMO, if the FOSS world makes something public, with extensive liberties, then the only thing that should be asked in return is that people preserve these liberties, like the GPL successfully enforces. These pushover licenses preserve nothing.
There is no one size fits all safest option. Details matter and each project needs to read the licenses and decide on which suits their needs best.
MIT is probably the safest option for a company creating a library wrapping their service where there is no real value in others taking that code. Or for simpler libraries that are fairly easy to reproduce so the need to steal the code is low. Or you just don’t care what others do with the code.
GPL is probably safest for some hobbies that does not care about companies and just wants everyone that is using their project to not bake it into a product they distribute. But also means companies likely wont want to use your project if it is a library.
LGPL might be a good option for library code if you want other companies to use and contribute back to some complex library you are using that is hard to reproduce in isolation.
Other licenses are needed if you want to prevent other hosted services from using your project without contributing back.
Different licenses exist for different reasons and it all depends on what you want for your project.