Sadly, the letter would be more effective if it included a large "donation" check, for an amount greater than those Intel is writing.
Sounds to me like a call for more investment in RISC-V, not less.
No, it's called bribery. If you give a politician money it's bribery. The closest we have to this is the revolving door.
Lobbying involves paying someone to give your letter to an elected. When you call your representative, you are lobbying. When the EFF engages the Congress, they are lobbying. There is campaign contributions, which go to a campaign, not the individual, and PACs, which involve buying messaging. But conflating bribery and lobbying is simply incorrect.