Can anybody elaborate on the idea that for RSA <=2048 is potentially unsafe? Is it true? It seems that even 1024 bit keys haven't been factored yet, much less 2

Can anybody elaborate on the idea that for RSA <=2048 is potentially unsafe? Is it true? It seems that even 1024 bit keys haven't been factored yet, much less 2048, so why use anything else currently? https://en.m.wikipedia.org/wiki/RSA_Factoring_Challenge#The_prizes_and_records https://en.m.wikipedia.org/wiki/RSA_Factoring_Challenge#The_...