For the record;
If the HOA contract limited the size and/or display of flags when it was signed, the homeowner MUST abide by them.
If the HOA tries to make and/or enforce rules written after the homeowner has signed the contract, that's illegal.
It's known as an ex-post facto law, and is unenforceable.
Actually there’s a lot more to changing the rules after the fact.
Depending on WHERE the HOA/POA is located .. and the way the by-laws are written. In our association it CAN be done - but it’s a matter of getting the majority of property owners to agree... hahaha ...like that’s going to happen. There was a time limit on when our restrictions could be changed ... and the ONE year the board had the opportunity to change them they did NOT take the opportunity to attempt to do it.. so it will be another 10 years I think before the opportunity arises.
It really depends on the HOA/POA... if the rules can be changed .. generally though it is so much trouble it’s a pain in the neck...