He does that because his real targets are the agencies that protect consumers and those that can challenge his business practices.Also, "they spent it on something I don't like" isn't "wasteful" in the criminal sense.
Elon promised fraud and abuse, but keeps pointing to things that are neither.
These other ones are distractions to keep social media buzzing.
Hence his attack on CFPB.
For example, Mark Zuckerberg in his podcast with Joe Rogan recently actually mentioned CFPB and their investigations (am roughly paraphrasing) into Meta and how that was ridiculous.
All these Tech billionaires have gotten together with Elon as their henchman and public face and it is really an attack on federal agencies by the Oligarchy, so they can do whatever they want, without any oversight.