What do you mean by "applied to the existing telecoms"? For this RDOF subsidy, no major telecoms have been given any money.
It's totally fair to criticize subsidies that have been historically given major telecom companies when they failed to deliver (and they have). But, I don't think it's fair to say "historically the US government has given subsidies to telecoms that have failed to deliver, so you should keep doing that".
It's totally fair to criticize subsidies that have been historically given major telecom companies when they failed to deliver (and they have). But, I don't think it's fair to say "historically the US government has given subsidies to telecoms that have failed to deliver, so you should keep doing that".