You contribute to projects run by others with the understanding that others run the project, is this not the default assumption others have too when contributing to FOSS?
There are certain unspoken rules you don't break out of a of tradition of process and decorum — this decision broke that rule, overturning 5+ years of accrued experience and institutional memory, so I can understand why this might feel like a rugpull which would reasonably upset the average contributor.
These antics are acceptable in a BDFL project where the stakes are low, but try this in an actual major project with thousands of contributors and see how it goes.
I think the best case scenario I can think of is the microsoft typescript js->go conversion, whereas the bun zig->rust is probably the worst case.