Without directly quoting from the text, give me a summary of the second home controversy in Gwynedd, Wales.

Controversy erupted in mid-winter 2001 when Seimon Glyn, Gwynedd Council's housing committee chairman and Plaid Cymru member, voiced frustration over "English immigrants" moving into traditionally Welsh speaking communities.[8] Glyn was commenting on a report underscoring the dilemma of rocketing house prices outstripping what locals could pay, with the report warning that "...traditional Welsh communities could die out..." as a consequence.[9]

In 2001 nearly a third of all purchases of properties in Gwynedd were by buyers from out of the county, with some communities reporting as many as a third of local homes used as holiday homes.[10][11] Holiday home owners typically spend less than six months of the year in the local community.

The issue of locals being priced out of the local housing market is common to many rural communities throughout Britain, but in Wales the added dimension of language further complicates the issue, as many new residents do not learn the Welsh language.[10][12][13][14]

Concerned for the Welsh language under these pressures, Glyn said "Once you have more than 50% of anybody living in a community that speaks a foreign language, then you lose your indigenous tongue almost immediately".[15] His comments attracted strong criticism of Plaid Cymru from other national parties.[15]

By spring 2002 both the Snowdonia National Park (Welsh: Parc Cenedlaethol Eryri) and Pembrokeshire Coast National Park (Welsh: Parc Cenedlaethol Arfordir Penfro) authorities began limiting second home ownership within the parks, following the example set by Exmoor.[16] According to planners in Snowdonia and Pembroke applicants for new homes must demonstrate a proven local need or the applicant must have strong links with the area.

By the end of 2001, as much as a third of the homes in the Gwynedd county was owned by owners not using these houses as a primary home. The local community was concerned that the use of the Welsh language was at risk because a growing amount of owners did only speak English, not Welsh. To combat this phenomenon, two national parks in the county started limiting second home ownership in the area, requiring proof of local need or strong ties in the area.